Slop.

if you had "tankies" with wealth and power, he'd have been targeting them

The PSL, along with a number of other Marxist-Leninist and progressive groups, is backed by an American multi-hundred-millionaire left-winger, Neville Singham. I haven't found him in any of the Epstein files at all, and he's a quite wealthy and powerful guy, along with being a literal tankie.

the kind of wealthy socialite Epstein was doing, you would have to abandon your communist principles entirely

This might be true though, but I think the emphasis might be more on "the kind" and "socialite" than wealthy. Doing stuff with Epstein kinda requires abandoning your principles it seems, if you had any, even if those principles weren't at all communist. Pedophilia being bad is a nominally common principle.