Can't attach an image here, but if you do a blank search on the Steam store and filter by macOS compatibility, the Steam Deck shows up. In the set of glyphs for OS support that appears under the name, it shows Windows, macOS, and Linux. Is this an error? Technically the Steam Deck would be compatible with macOS in the context of Steam Link/Remote Play, but it might be a bit misleading to present it this way.