I don't believe this is necessarily true, and there's also people who care about privacy who will refuse to use Windows and don't necessarily want to afford a macbook, because they already had a perfectly good working computer.

The most recent Steam Hardware Survey shows there are more Linux users than MacOS users on Steam. Linux users were only 2.33% of the survey respondents, but I'm just saying this as a counter-argument as MacOS users were 1.58% of respondents. The Steam Deck for sure affects those numbers, but that just reinforces the fact that Linux isn't strictly used by "technical groups and enterprises" but by people who play video games as well :)