It’s implied that in this example the two sample teams are in the same division. He would’ve specified (for example) “what’s better a 12-0 FCS team that’s beaten winless FCS schools or a winless FBS school that’s only lost to undefeated FBS schools.” If he doesn’t have to specify those types of details it’s implied that they play at the same division.
The best answer to OP’s question is “we don’t know”