I have seen some of these guys' videos. I believe they said in one of them that they aren't really interested in collecting paper money, they are much more interested in coins and silver and it sort of makes sense seeing how almost all of their videos are about coin roll hunting and silver. Seeing also how this forum is focused primarily on paper money, I think its very unlikely that they're members here.
But then again I have no idea I'm just making deductions based on the information I know maybe they are members here. Only they know...