As you can see here is gold on protondb, it is unsupported on deck only because it's a really heavy game, and the deck does not have enough horse power to play well, but on my beefy desktop it works.
But yeah, the denuvo anti-tamper for sure does not help the performance.
Ah interesting and good to know. Usually I see games that perform poorly marked as playable but with caveats. I guess it just performs so bad that it is effectively unplayable.
I had the same issue with forza for a long time. as far as I can tell, the only fix is to get an AMD GPU. I uprgaded my 1070 to 7900xtx and now forza runs like a dream. never tried those other two games though