Currently, Vive Focus users get labeled as Quest users. This is not a huge problem since almost no one uses a Vive Focus.
However, if VRChat ever comes to the Pico Neo storefront, it will most likely label them as Quest users as well.
It is probably a good idea to move away from Facebook-centric labels for Standalone players.
An alternative could be something like "Mobile", "Standalone", or "Android"