They hit upon a strong point with comparing chatbots to talking with a psychopath (about 56-58 minutes in.) Discouraging someone from talking to other people is a classic method of increasing one's control over someone else.
It bears repeating that the chatbots' sycophantic nature isn't in order to help you, but rather for their own (owners') goal - that is, to keep you coming back to it. It's quite like grooming, if you think about it. With the current end-goal of getting users addicted.
The future end goals? Still to be determined. If enshittification has taught us anything, it should be that any technology (in the current framework, at least) that gains significant adoption can and will eventually be used to exploit its users.