Excuse me stewardess, I speak twitter slang.
The specific construction "the dolls" is gay guy lingo for drag queens, probably stemming from referencing Valley Of The Dolls (the title is a pun on slang for a 70s drug and also the aspiring actresses being like barbies). Something like "the dolls are backstage and ready to go on". Some HSTS drag queens more widely used it to refer to HSTS in general.
Zoomers learned drag queen slang from watching drag race, so HSTS zoomers (and I assume some AGPs, although I don't think they really watch that show) started using it on twitter. The AGPs then picked it up off twitter. There was an amusing mini culture war a couple years ago where people started arguing that "the dolls" is trans specific lingo and cis people using it are doing a hecking cultural appropriation and saying "the dolls" in reference to gay guys in drag is transphobia.
Anyway when Kevin says "the dolls", it's because he picked it up from trans twitter via zoomers. He does separately have a tonne of disgusting AGP fetishes about being a sex doll or a pool toy or whatever, but that's not what he's doing when he says "the dolls".
I regret to inform you he's already done that when he took his first post-breast-implant shower.