It's not a critique of his work (although to be honest, he's probably not in the top 10 physicists of the 20th century). Rather, it's a critique of the mythbuilding that seems to surround Feynman--and only Feynman, you don't see this stuff around (say) Hawking or Einstein--that turn him into the only physicist worth emulating.
As for your later contention that he's less visible to the general public since the '90s, well, I had Surely You're Joking as required school reading in the '00s, the narrator of the video similarly remarks on it being recommended reading for aspiring physicists in probably near enough the same timeframe. Oh, and someone cared enough to post a link today to his blackboard, and (as of this writing) 58 other people cared to upvote it.
As for your later contention that he's less visible to the general public since the '90s, well, I had Surely You're Joking as required school reading in the '00s, the narrator of the video similarly remarks on it being recommended reading for aspiring physicists in probably near enough the same timeframe. Oh, and someone cared enough to post a link today to his blackboard, and (as of this writing) 58 other people cared to upvote it.