This Pastor Wolfmueller mistakenly associates the death of Christ with accomplishing the destruction of the devil at the crucifixion. The Hebrews 2:14 text says that the death of Christ "annulled him" who had the power of death. This describes the end of Satan's ability to accuse the brethren when he was cast out of heaven at Christ's resurrection-day ascension (as in Revelation 12:10). That power to accuse the brethren was legally "annulled" in heaven on that day.
It's good that he does recognize the numbering of Revelation 7 & 14's selected 144,000 as having a "military" connotation, though. This numbering of 12 thousand from each of the mentioned tribes would have been recognized by any Jews as a reflection of when their nation was divided up into groups of a thousand fighting men for doing battle in the days of entering the land of Canaan. Similarly, the 144,000 First-fruits (who were the resurrected saints of Matthew 27:52-53) were going to serve as groups of thousands performing spiritual battle against a loosed Satan who had just had his millennial chain removed for a "short time" and a "little season" at Christ's ascension in AD 33 .
He also makes a good point that "nations" as a corporate entity cannot become baptized believers (you can't baptize a nation), but you can baptize individuals. He apparently thinks that Postmillennial thinking teaches that all world governments and civic organizations will become entirely Christian in their governing practices. This is not necessary for the gospel to "fill the whole earth" as the stone kingdom of Daniel 2 was going to do. The leaven of the kingdom is working incrementally to bring its effects in the entire world, but those effects do not produce a universal salvation of one and all. Perhaps some Postmillennial adherents teach this, but I don't think it is a universally-adopted idea.
