Cis yes, and I'm not sure about the rest. But saying they get mistaken for trans wasn't meant to imply they're mostly lesbian either. (Although I did stumble into a TERFy lesbian discussion on Reddit once back in the day and that's probably where I heard the part about more when looking butch.)

As a cis het nonterfy feminist old woman who sometimes wears dresses but never makeup, and a buzzcut, I don't care when someone mistakes my gender or sexuality. But that's probably because I yeeted a lot of my fucks along with my uterus many years ago.

Most are, yeah. IIRC, cis lesbians are the demographic most likely out of anyone to support trans rights outside of trans people themselves, by a large margin.