As it literally says in that text you linked, not every posture works for everyone. I did not claim that a laptop leads to the best situation for ergonomics, I just wanted to debunk the "there's no way using a laptop could ever be healthy" claim which both a professional I know as well as my own experience don't agree with. It can be healthy, though admittedly most people don't do it right.

I'm glad I listened to his advice because it seemed to fix my issues for good. If you found a comfortable setup that's different then that's great as well.