I worked on a show in October with an M2 Mac Studio where we used Isadora and the same dialog came up at some point. I can’t remember if we just installed Rosetta because Apple demanded we do so for some reason (though we never used or needed Rosetta for Isadora) or if we were able to just tell that warning dialog to go away and shut up, but either way, the warning/dialog is a complete red herring. If you can’t make it go away without installing Rosetta, just install Rosetta to make Apple’s dialog shut up, do nothing with Rosetta at all after it’s installed (because you won’t need to), and then continue on your merry way.