I looked a little at your link. The first thing I noticed was this:This passage is not the death nail to limited atonement. The following is from a commentary article on this verse titled "2 Peter 2:1 and Universal Redemption" by Simon Escobedo III. If interested, the whole article can be found here http://vintage.aomin.org/2PE21.html
"To summarize this argument, then: in the thirty New Testament occurrences, where the Greek term agorazo is used (this is the greek word for the word "bought" in the verse), only five texts are clearly and indisputably redemptive (2 Peter 2:1 being the lone exception). Furthermore, in these five instances, there are seemingly three undeniable contingencies or features that strengthen the redemptive contexts. Namely, a) the purchase price or its equivalent is stated in the text (i.e., the blood, the Lamb; cf., 1 Cor. 6:20; 7:23; and Rev. 5:9), or the purchase price is implicit in the immediate context (Rev. 14:3, 4); b) redemptive markers or language is used, and b) in every case the context is restrictive to believers (cf. 1 Cor. 6:20; 7:23; 5:9; and 14:3, 4). None of these features or contingencies are to be found in 2 Peter 2:1.
It has been demonstrated that the term “Master” (despotes) refers to an owner in a master- slave relationship. The meaning here is not of Christ as Savior or Mediator (despotes is never used as a redemptive title), but to Christ (or the Father) as Sovereign. It has also been demonstrated that the term “bought” (agorazo) in the New Testament is most frequently used in non-redemptive contexts. When used redemptively there are specific pointers that are conspicuously absent in 2 Peter 2:1 (such as the purchase price, believers as the lone object, or the presence of other mediatorial or redemptive features). Since this is so, it of necessity eliminates the assumed non-Reformed interpretation, at the very least, as the only viable interpretation of 2 Peter 2:1
In Conclusion
We are left then with two possible understandings to the text:
1. The term is being used redemptively. Hence these were men who were bought by Christ (purchased, redeemed) but lost their salvation when they became apostate.
2. The term is being used non-redemptively; hence Peter is not addressing the extent of the atonement, but is providing an OT example (similar to Deut. 32:5-6) of a sovereign master (despot) who had purchased slaves and on that basis commanded their allegiance. "
He stated his Calvinistic presuppositions. Then based on those presuppositions declared that the rendering sometimes given to the verse (such as I gave it) must be absolutely wrong. On that basis (a false premise), he sets out to prove the verse's interpretation must fit his own paradigm.
Don't you see some inconsistencies there?
Consider the verse:
2Pe 2:1 But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
and in the Greek:
2 Peter 2:1 εγενοντο δε και ψευδοπροφηται εν τω λαω ως και εν υμιν εσονται ψευδοδιδασκαλοι οιτινες παρεισαξουσιν αιρεσεις απωλειας και τον αγορασαντα αυτους δεσποτην αρνουμενοι επαγοντες εαυτοις ταχινην απωλειαν
Concerning the word, "Lord" or "δεσποτης."
The word occurs 10 times in the NT.
5 times it is translated as "Lord," 4 times as "master," and once as "master" (Lord)
In the last case, 2:21:
2Ti 2:21 If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work.
--It, of course, refers to Christ.
Simeon's prayer:
Luk 2:29 Lord, now lettest thou thy servant depart in peace, according to thy word:
Act 4:24 And when they heard that, they lifted up their voice to God with one accord, and said, Lord, thou art God, which hast made heaven, and earth, and the sea, and all that in them is:
Jud 1:4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.
Rev 6:10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
As you can see 6 out of the 10 times it is used the word despotes refers to Jesus Christ our Lord.
It definitely is used in the sense of our sovereign Lord in Acts 4:24, Jude 1:4 and Rev.6:10. In these cases one must recognize Him as such in order to be saved.
Concerning the word "bought"
Strong's says:
Note: Especially to redeem; to buy to redeem. That is the meaning of the word.αγοραζω agorazo ag-or-ad'-zo
from 58; properly, to go to market, i.e. (by implication) to purchase; specially, to redeem:—buy, redeem.
Remember Hosea. The Lord sent him back to the market place, to the slave market to buy back, to purchase his wife, to redeem her and bring her back again.
That is a picture of redemption.
The purchase price has been paid. It has been paid for all mankind. If it is refused there is nothing that can be done about it. That price must be gladly accepted and received as payment paid. Jesus paid it all. He paid it with his blood. The justice of God was satisfied. The slave must take that gift and receive it and then be thankful to the one who provided it--the great Judge himself.
These false teachers denied that Christ paid for their salvation, that he was the purchase price. They refused this doctrine that Jesus paid for their sins.
Not only did they refuse the doctrine, they denied the Lord himself.
Obviously these false teachers can't lose the salvation they never had.
But they can denounce a true doctrine as John 3:16 and in doing so unwittingly denounce Calvin's false doctrine of Limited Atonement.