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Proton is a modified version of Wine. If the underlying game is sending a bug/crash report, it may "see" itself as running under windows as that is what wine presents.

https://github.com/valvesoftware/proton

"Proton is a tool for use with the Steam client which allows games which are exclusive to Windows to run on the Linux operating system. It uses Wine to facilitate this."

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Correct. Steam, a native Linux app, will run Windows games via Proton. As Steam itself, which is collecting the data in TFA, is a Linux app, it shouldn't be affected by thinking it's running under Wine/Proton. As to your original question, I don't think many developers release information on what OSes their players are using, so I don't think we can tell

True but irrelevant, these numbers are reported by Steam which is running natively on Linux.

It launches proton, it is not itself running on proton.

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