Despite their theology, they have the right KJV mistakes.
No, there are many errors shown there, and while I will not go over every verse he showed, I will point out a few errors he made.
1 John 5:7-8 contains additional text which was added to the original. "For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one." The italicized text was added to the original manuscripts. Most modern translations agree that this was an uninspired addition to the Latin Vulgate to support the unscriptural trinity doctrine.
The Worldwide Church of God denies the Trinity. You believe this correct?
Genesis 1:2 should read "And the earth became without form . . . ." The word translated "was" is hayah, and denotes a condition different than a former condition, as in Genesis 19:26.
This is an attempt to support the Gap Theory. Do you believe there was a gap between Gen 1:1 and 1:2 and that death was in the world before Adam's sin?
Leviticus 16:8, 10, 26 in the KJV is "scapegoat" which today has the connotation of someone who is unjustly blamed for other's sins. The Hebrew is Azazel, which means "one removed or separated." The Azazel goal represents Satan, who is no scapegoat. He is guilty of his part in our sins.
This is utterly false, scapegoat is correct. The scapegoat represented the people's sin being forgiven. Here is what Matthew Henry says of the scapegoat.
2. The goat was then to be sent away immediately by the hand of a fit person pitched upon for the purpose, into a wilderness, a land not inhabited; and God allowed them to make this construction of it, that the sending away of the goat was the sending away of their sins, by a free and full remission: He shall bear upon him all their iniquities, v. 22. The losing of the goat was a sign to them that the sins of Israel should be sought for, and not found, Jer. 50:20.
If anything, the scapegoat represents Christ who took our sins upon himself, and not Satan. Wow.
2 Kings 2:23, should be "young men", not "little children."
Here the writer assumes they were all male, and that they were much older than the verse says. While this was a miraculous event no matter how you look at it, it is much more difficult to believe two bears killed 42 men than children.
Matthew 27:49 omits text which was in the original. Moffatt correctly adds it, while the RSV puts it in a footnote: "And another took a spear and pierced His side, and out came water and blood." The Savior's death came when a soldier pierced His side, Revelation 1:7.
Here this writer claims Jesus died because a soldier pierced him with a spear, but the scriptures say Jesus willingly gave up the spirit and died, and that afterward a soldier observed he was dead and then pierced him with a spear.
John 19:33 But when they came to Jesus, and saw that he was dead already, they brake not his legs:
34 But one of the soldiers with a spear pierced his side, and forthwith came there out blood and water.
I could go on, almost everything this writer said was error, or he was nit-picking at words. And note in the last example he draws his conclusion (which is error) from the RSV.