I wondered about the working hot part... it looked to me as though his touchless detector lit up a few times. That's stupid of course!
Replacing the old device makes a whole lot of sense in a contractor job where we're talking warranty but not really for a DIYer, which is who this video is aimed at. A DIYer only has to blame him/herself if the device fails a few weeks or months after s/he put it back into the wall.
Of course it is debatable whether DIY electrical instruction videos are acceptable at all, but if they do exist I prefer them to show at least decent work practice instead of shoddy or outright dangerous.
