I’m inclined to trust my professors that had years of experience, rather than someone off the internet.
The FDA doesn’t recommend it, and I am more inclined to trust them instead of a single professor. If you really do it in a different room there should be not be any contamination, but in my opinion it is bad practice anyway. It’s much safer just to cook the chicken to the right temperature. But maybe you can point us in the right direction if this should be handled differently in bigger kitchens, like you said.
They’re only correct because they’re referring to a very specific situation that, for all intents and purposes, is completely wrong for any situation the average person will encounter.
So no, they’re wrong from a consumer perspective but right in factory conditions. So no matter what their professors say, don’t listen to this person because you’re not cooking in factory conditions.