This is basic law of conjunction: the probability of two things being correct must necessarily always be less than the probability of one of them being correct. Famously illustrated by the Conjunction Fallacy. So, since EvoPsych depends on claims being correct in both Evo and Psych, and the latter alone has a reliability rate of only 1 in 3, then the conjoined reliability rate must necessarily be less than 1 in 3. How much less?

This is just wrong. Evolutionary psychology does not depend on everything else in the rest of evolutionary biology and psychology being right. That would be silly. I wouldn't describe the post as useless, but yeah, as others have said, this could have been made a lot shorter. He's ranting too much.