Having raced motorcycles most of my entire life, and occasionally cars, I’ll whole heartedly disagree with that article.
I have several rotors in my garage (I think they’re still there) that are warped to the point you can rock them like a round bowl and see the obvious bowing of them with the naked eye. Put them on a flat surface and one of them has an almost 1/4” bow in it.
Rotors most definitely warp!!! Especially on motorcycles when you’re racing in the woods, they are hot and you hit water.
While some of this article may be true, rotors most definitely warp!!
I’ll see if they’re still in the garage and snap some pics