Not sure why they have multiple debs and RPMs when meta package dependencies can solve that.
Otherwise?
It's because Windows only has an x86_64/amd64 CPU architecture.
Here there's ones for multiple ARM CPU architectures going back to the first raspberry pi.
If Windows was readily available for those you can bet it'd be just as confusing with "wait am I armv6 or armhf? Or oh shit am I armv7??"
Open-source training texts intended for pairing with your intended style of output have been around for far longer than OpenAI has been grifting data from the entire Internet and collected book works. It came across like that's what they're using, not some shit off HuffingFarce that was built off of AO3 and Harry Potter.