I hate how he waits until the very last moment of the video to tell you that they're not a possible contender against traditional heat pumps because they have a very low power density.
On the whole I agree because I don't love this guy's presentation style, but he seemed to have the best video on the topic. That said, I think he goes on to say that there are some improvements to the desalination portion that should improve it significantly in the near term, and perhaps make it a viable option in the future.