What the hell even is that? You're either born ugly or you're not. It's an ignorant attempt at associating men's retribution towards women's bullshit as "basement-dwelling."
An involuntary celibate (INCEL) gets no pussy, because he's ugly/physically undesirable. Naturally, he might gravitate towards blackpill ideology or remain bluepilled and unaware of female nature.
Blackpill basically teaches them that women are and have always been materialistic and selfish, choosing the best men to breed with. You don't need to be an incel to know that.
The whole idea is as garbage as "trans": here's a bunch words, you have to use them **my way** from now on.