Linux Distros (Gaming) From 2018 to 2025 - OMG the Change!

The most reliable stats would be the Steam hardware survey.

Is this a reliable set of stats then?

This is PC operating systems which by ProtonDB definition excludes Steam Deck. See https://boilingsteam.com/cachy-os-keeps-spreading-and-takes-second-place-among-linux-distros/index.html for more information.