Yeah theoretically it’s that easy but irl it’s not…
There’s already a Mac OS version, so it they’ve presumably already handled that side of things.
IIRC, Factorio uses SDL - which afaict already targets macOS.
Like most macOS games, it most likely is an x86-64 game that Apple's x86-64 emulator does an admirable job of emulating. As far as I can tell, very few Mac games, even new ones, are proper ARM builds currently.