I think a more charitable interpretation of TFA would be: "I Have Come Up With A Recipe for Solving PyTorch's Cross-Platform Nightmare"

That is: there's nothing stopping the author from building on the approach he shares to also include Windows/FreeBSD/NetBSD/whatever.

It's his project (FileChat), and I would guess he uses Linux. It's natural that he'd solve this problem for the platforms he uses, and for which wheels are readily available.