On the Mac version of Steam, 32 bits Mac games are reported inside Steam's interface by a 🚫 icon next to their title in the games list and a warning label in their description. Clicking on the Apple logo on top of the game list filters out both Windows-only and 32 bits Mac games from the library. This is based on the absence of either "macos64" or "macosapplesilicon" in common/osextended in SteamWorks (manually declared by third party developers).

But games that were delisted from the store, and do not have either macos64 or macosapplesilicon in common/osextended (so, not a database issue) are wrongly displayed and treated by Steam as if they're 64 bits. This is true both in the beta and stable public versions. Here are a few examples of delisted 32 bits Mac games wrongly reported as 64 bits by Steam:

Games which only have their Mac version delisted from the store:
- Cave Story+ (appid: 200900)
- Choice Chamber (appid: 359960)
- Dungeon Defenders (appid: 65800)
- Fractal: Make bloom not war (appid: 61310)
- Lightfish (appid: 116120)
- the Swapper (appid: 231160)
- Ultionus: A Tale of Petty Revenge (appid: 279160)

Game completely delisted from the store:
- Driver San Francisco (appid: 33440)