>The implication being that the other hosts looked fake, not like engineers or rocket scientists but like PR people.

You made the same incorrect jump! The implication is only that he's definitely not in PR so he's probably a real engineer. The others have the looks to be in PR (which is why he "wouldn't be surprised" if someone said they were). Yet he never said they couldn't also be real engineers.

They are just attractive enough that it's ambiguous as to whether or not they are real engineers or just PR folks.