Phoronix has a good take on it [0]. Michael reports the same tiny slip but also points out that Linux was at 2.29% at the end of 2024 and sub 2% at the end of 2023. Those are pretty decent increases considering the size of the installed base. Hopefully the new Valve hardware coming out soon gives Linux another good bump by the end of 2026.

[0] https://www.phoronix.com/news/Steam-December-2025-Survey