I just picked up an M1 MBP and when I went to the app store to download my purchased apps, my (iOS-purchased) Model 15 app showed up as available for my Mac!!! This prompted me to notice that the App store now shows it as an iPhone, iPad, and Mac app, in-fact, it prompted me to try on my non-M1 work mac and... TADA! it works too!
How long has Moog been keeping this secret? Thanks Moog!!!