Setlist.fm is rarely accurate, I have no idea why but people have a tendency to post complete bullshit on there.
GWAR aren't known for mixing up setlists, and other than dropping a song or two I don't think they have in quite some time. My guess is that setlist contains most of the correct songs but the order is probably a bit messed up. Can't imagine bringing out der Jagermonsta two songs in either. I'm thinking Gathering of Ghouls is still there, and I don't think they'd play Uberklaw since they seem to have avoided that on the more LiS themed tours and that would put the number of LiS songs more than BPoH, but who knows, maybe they did.