I don't think much of all the criticism. Keysight sell the U1282A as being a heavy-duty waterproof DMM. We all know that marketing claims can be somewhat creative, so it's good to see those claims being tested. It's no different to checking out whether a meter meets its accuracy or safety specs. Yes, it's obviously informal and non-scientific, but what else could anyone do? It's also more demanding than tests in a controlled environment. I'd hope we all agree that this is a seriously rugged DMM that exceeds its specs. Ditto for the Fluke 28-II. No-one would want to destruction test their shiny new meter, so Dave has done the world a favour by breaking them for us.
As far as I can see, there are no losers. Keysight and Fluke have had their DMMs independently abused. Dave had fun making the videos, we had fun watching them. We can all see that both meters are hard to kill. And this information is in the public domain so everyone benefits for the foreseeable future.
I guess many people here will be lab-based, so this type of meter isn't that relevant to them. Perhaps that explains the negative responses. But DMMs are also needed outside or in industrial environments where all sorts of nasty things can and do happen.