Yes that is because the blogger here is engaged in a
deductive fallacy. There certainly are are large numbers of women and men engaged in the described defect/defect equilibrium. The blogger errors is in his assumption that his analogy is universally true when it is not. There are a large number of educated free men and women who do a reasonable job of selecting their mates and voluntary choose cooperate/cooperate options.
Famous words spoken before the collapse of Western society. Let's revisit this in another decade or two when marriage has collapsed and subcultures are fighting against the State which is trying to eradicate them per a variation on the Fall of Western Roman Empire, Hitler or Yugoslavia model as everything disintegrates and collapses back to a higher degrees-of-freedom, i.e.
Stage #5 in your model as I edited it.
The salient point is that he never wrote that no one was getting married. Heck his own two sons are married. He is writing about the devolution of the society and the end game. Your perspective is that of a quarterback who throws the football to where the wide receiver is now, not where he is going to be when the ball arrives at the destination.
The fact that some individuals fail in the face of selective pressure does not mean we must coercively impose a forced solution on all men and women.
That his prescription is a natural result of the disease, is irrelevant to why you seem unable to separate concerns and acknowledge his truths.
Individuals who are engaged in defect/defect equilibrium are sadly maladapted to the current environment and will be gradually replaced over time by those who do not make unhealthy choices.
The current Marxism (Stage #4) environment is maladapted to the Knowledge Age and will be replaced also with Stage #6.