The thing that always stick in this craw about said framing is the implication that if free will is an illusion, that it doesn’t “exist”.
Illusions - they exist, and when we’re talking inner states… Are words not illusions in some sense? They’re really just patterns of sound, contrasting foreground/background shapes etc. and yet they seem to do some real things at times.
Totally, there seems to be a fairly uni-dimensional notion of existential quanta operating for free-will naysayers. The mind boggles at the recursive gymnastics that would unwind such an experiential sensed mental state from atop a wobbly stack of infinite turtles.