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I agree with the parent poster. They've chosen the best examples to show off, and yet all of them looked "off" to me. Perhaps because I was paying close attention I was more likely to notice it, but there was definitely an uncanny valley effect to it all.

To be fair a lot of the same applies to conventionally dubbed films, and then some.

It kinda reminds me of some of the old multiplayer PlayStation games that would flap your characters gums when you used the mic.

The motion lines up with the words more or less but it lacks any sort of emotion or emphasis like you'd see with real actors

It's very difficult to judge from these tiny clips. They're supposed to be showing off the technology with this video, but choose many clips with very little dialogue.

A few examples are very "gum-flappy"