Not really, Scarlett O. I may be wrong but if Henry is Matthew Henry, I think he is a Calvinist.
If you say "you can tell that they are not Calvinists" because they opined that those lost people in hell "had the opportunity" to be saved and neglected it, many Calvinists still think that way, really.
Harold Camping, for instance, whom one here on this board described as "sound in doctrine" when it comes to salvation says that the sinner must plead to God for mercy and when he does so God is gracious enough to save him by regenerating him, or quickening him, or in other words, "causing him to be born again".
This mostly right after he says that the unregenerate cannot come to God on God's terms (speak of double speak).
How then can one plead for God's mercy if he does not have the ability to come to God on God's terms ?
He that cometh to God must believe that He is says Hebrews 11:6, and I guess those two words, "He is", has the accent and emphasis on "IS", which includes everything there is to believe about God.
So, yeah, they may be Calvinists, for all we know.
Cheers.