Tim Sweeny has been openly vocal about not liking Linux in the past. They're probably upgrading to 64bit because of memory limitations due to of the amount of cosmetic DLC they're adding.
That is without a doubt, unquestionably, despite over a decade of reading comments here from all sorts of Blues News "celebrities", the absolute most hilariously stupid thing I have ever read on this site. I can only hope that you're being facetious, in which case hat's off to you, but at this point the level of vitriol towards and ignorance of the game dev industry evident on this site is so great that I'm inclined to take this complete absurdity at face value.
If you can play games on it, it's a gaming platform. People game on Android phones and tablets. Android is Linux based, is that not a gaming platform? The PS4 uses a port of FreeBSD as its operating system, is that not a gaming platform? The Switch's OS is also BSD based, as is macOS. If they can support those platforms, why not macOS?
An oscillator built in 1968 can play Space Wars, does that make oscillators gaming platforms? What about an ATM? It runs Windows CE, and that can run games; are ATMs gaming platforms?
Fucking Christ, the dogmatism in games' tech is comical. Stallman doesn't even stand out anymore.