One thing to note in case there are any other fans of Paradox GSGs around here.
It's not just on the new ASI macs. All of Paradox's current GSGs like Crusader Kings 3, Hearts of Iron 4, and Stellaris are now broken with Big Sur. They will not even launch even if you are running Big Sur on an Intel Mac.
It's a confirmed issue by Paradox and so far they have said there will be no patches to fix this until each individual game is due for its next large patch. As some may be aware, sometimes the games only get one large patch a year.