Because that would be a distraction to the point they're actually making.

The point is thoroughly undermined since we can't judge the veracity of their claims

And discussing the specifics of whatever OS GP uses is exactly the type of OT he was wise enough to avoid.

Personally, I think he uses Emacs.

They must mean macos, right?

I think you could find a dozen different operating systems that someone, somewhere, would say similar about.