Hmm, I also doubt the validity of this, as you don't see the machine behind the head and it's all too easy to imagine someone's hand is stuffed into a very well-made puppet head. Although the movement of the tongue is very good and that then makes you wonder.....
very interesting but still, with the poor quality of the footage and the lack of being shown how the head is actually hooked up to the machinery I cannot help but doubt it.
Certainly the head couldn't be maintained long-term on the machine.