Without knowing the specifics, I think this is a lot closer.
PG Music had already announced its intent to develop code usable on both platforms. I suspect they succeeded, at least in part. Did you see how early the BIAB for Mac beta testing began, and how quickly it ended?
BIAB 2020 Win Audiophile; [& 2020 Mac UltraPak]. Software: Cakewalk, Adobe Audition, Ozone, Encore; Win 10 64 Pro. Hardware: custom i7, 16 Gb; Roland Integra-7, Focusrite 18i20(2), TCE Finalizer, Behringer X-Touch, Adam sub & monitors.