They actually do acknowledge that women have a greater investment in reproduction than men do. So they've attempted to fit "sluts" into this paradigm in two ways: 1. she's trying to get pregnant with "alpha" genes, 2. she's a hopelessly broken woman because she's not being selective.

Now, you'll notice that those are basically incompatible. If she's evolved to bone lots of hot guys until she lands an alpha fetus, how is she also a broken person who will be an awful mother? Additionally, women "riding the CC" are being selective - they don't fuck "betas," after all.

They haven't managed to come up with an explanation for how beta genes have persisted if betas just get cuckolded with alphas. The closest would be claiming that society "betafies" boys. How on earth could it possibly benefit women to "betafy" their sons if betas never get laid (and reproduce)? And yet, they vehemently deny the influence of culture on other aspects of behavior.

Their entire theory crumbles upon even casual inspection.