If Linux is only popular on Android, Chromebooks, SteamOS, servers, embedded devices it strongly suggests to me that people are perfectly content with using Linux as long as they don't have to use the Linux desktop. (I know it's available on the Deck, but it's not the primary UI for it).
The Steam Linux numbers used to be indicative of Linux desktop popularity. If their large rise now is in large part due to the Steam Deck, that doesn't quite mean that the Linux desktop is getting popular. So it seems this is a totally fair nuance to me?