Linux sits at <3% users or so.
https://gs.statcounter.com/os-market-share/desktop/worldwide...
~10% is a good guess. AI tools run much better on Ubuntu/Fedora out of the box, and that is not exactly a secret either.
On the stats website you linked at any time in the last 20 years with the exception of the two most recent months. To be explicit all of the data points are closer to 3% than 10% except July and August 2026.
I don’t think it’s that surprising that the GP has a misrepresentation of Linux desktop deployments given that the uptick is recent.
This includes SteamOS.