The word Celt is the Anglicized form of the Greek word Keltoi, which means “the people who are different.*” In Scripture, all nations, except the Twelve Tribes of Israel, are referred to as Gentiles (Foreigners), so the only people who are different are Israel. The word Celt is therefore another word for Israelite.
The logic behind that is hilariously insane. Somehow he missed that every language has a word for foreigners/people who are different. Then mixes and matches his bogus Greek with bogus Hebrew as if the Greeks followed Hebrew language conventions.