Can confirm Xbox One, PS4s, and Switch do not count towards $50 bonus. There was a post a few days ago that showed the fine print showing that was the case, but it seems it has indeed changed and my Xbox One X would not receive the bonus if I tried to trade it in.
Can you trade in multiple consoles and get $50 bonus for each one? I have a Xbox Series S and a Xbox One X that I'm hoping both get the $50 bonus towards a Series X upgrade for my nephew.