Before reading the background info, I was going to recommend a much simpler fix, but they actually already mention it in there: "Also the mouse cursor size can be changed."

This was going to be my suggestion because it also fixed a similar CPU/GPU related issue many years ago: Apple's own TV.app would have minuscule color handling differences whenever subtitles would show during a movie. This was driving me nuts while showing a moody black & white film for a movie night - every time a subtitle would pop up, the entire scene's black levels would shift slightly (and it wasn't any kind of adaptive/localized brightness or anything like that, it was the actual rendering).

Some online sleuthing revealed it was GPU related (pure GPU video decoding vs. the CPU overlaying subtitles on the screen), and that bumping up the cursor size (even the tiniest amount) in mouse settings would fix it. It worked.

It's barely noticeable, but I actually prefer the slightly bigger mouse cursor now anyway, so it's part of my standard macOS setup.