What he is says is true. A skank can be a slut. A fat ugly neckbeard cannot.
In high school I met several guys who claimed, I fucked this girl, I fucked that girl. They were lying, just the way I encounter men on the internet bragging about their "plates." They, too, are lying. Same with Roosh and Roissy and Krauser. Liars, all them, doing what they do for money and attention.
I have met fat, ugly women who were sluts. In high school I once encountered a line of high school boys outside a trailer. I immediately knew what was going on. When I asked who the girl was (turned out there were two of them) I recognized the names. Both were fat and ugly.
By the way, the few PUAs I've known have always targeted unattractive women.
If there weren't any overweight unattractive women the number of sluts available would just about collapse.