Adobe no longer lists older versions by default in Creative Cloud. However, you can still download Photoshop 2021 if you have a subscription. Here are the official and safe methods.
Before the native update, M1 users had to run Photoshop through "Rosetta 2," Apple’s translation layer. While functional, it didn't utilize the full potential of the ARM-based architecture. 1. Massive Speed Increases adobe photoshop 2021 mac m1 work download
Select to find specific 2021 builds (like Version 22.3 or later). Adobe no longer lists older versions by default