the problem that I have with reading this kind of things is that they are written by guys who are not getting laid
if someone is not really an expert in his field , then whatever he says must be taken with a pinch of salt as it might easily let out frustrations and exaggerate
it is the same thing like Dane blizerian tells you about how to seduce women , when he is just paying them
also , it is not about women being hypergamous , it is about women being hypergamous with older guys , while with younger guys they would go with the flow . And this gets more visible as women get older