Does he not meet the criteria of a famous professor?
Person 2: [gives examples]
Person 1: oh ho! But those people are not in academia any more! They're not "practicing scientists"!
Person 2: ...
There's a kind of Schneierism thing that happens in these threads; like: I could ask, ok, name a scientist practicing in this field. They exist, but they don't have names your 3rd grade science teacher knows.
Again, to be explicit: he did not establish that his claims were true.
That is why it's quite worthwhile to ask if Watson is the best example available. The guy was pretty openly and casually sexist, and his racism wasn't much better.