Or this Stallone interview (also YT recommendation) https://www.youtube.com/watch?v=dFlybZL1mWE If a movie star went into that contemplative mode today, the interviewer would feel some kind of awkward tension and would immediately crack a joke or somehow lift up the conversation back to the surface level. You only get this stuff now on podcasts.

As for your video, just imagine uttering the words "complex mathematics" today unironically in an entertainment-related interview. The interviewer would have to immediately ironically say something like "oh, you lost me there" or something like "you're such a wizard, I can't even file my taxes" or so. Somehow genuineness and any level of seriousness is seen as kryptonite for the media today.