That's weird, for me this build doesn't seem to change anything about AA. If you hold down shift while double clicking on the game icon to run it, Unity opens a graphics quality menu. This is supposed to default to "fantastic" but maybe I did something to mess this up. Anyway, you can change it and I believe Unity remembers the change.
I have replaced the uploaded build with a new one, still 5b but marked "February 2022" which I hope has the right default.