In other words, according to the datasheet, their cells should not be exploding or catching fire when subjected to those abuses, and those that do are defective....
Yes, the modern cell-level safety features are quite remarkable; in fact, I have "verified" all of the listed conditions on a few cells, and I haven't been able to produce a fire on a good-brand 18650 cell, ever. Including over-charging a cell with 30V, 10A supply for an hour or so. A bit of electrolyte smell is all I get.
However, there is something you miss: it's the rate of
risk going up, as the layers of safety are being bypassed. These cell-level safety layers are good, but not perfectly reliable. They only exist for the worst case (BMS failure, mechanical failure of external case), and need to be cheap on production level. If you have thousands of cells being abused outside normal specifications, some may catastrophically fail, even if the datasheet specifies it shouldn't happen. You may also hit some strange combination of corner cases which isn't covered by the few standardized tests; the cell might comply to the standards, and still fail catastrophically, using a modified test with different parameters.
I'm against scaremongering, quite the opposite, I want to say, do whatever you want, the brand cells are quite robust against abuse. Just be aware that you are doing something not originally intended to be that way. Do it on purpose, understand there is a risk, however small, and be safe.
Also understand that a manufacturer needs to take a strong stance for such non-intended purpose, for legal reasons. Another option would be to provide protected cells and give consumer support for them; clearly, it's outside their core business.
Of course, producing an expensive PR video seems stupid at least, but companies do such things, maybe don't take it too seriously, keep using the cells as you wish.