This can be a contentious topic, as any gear discussion would be. But that 1st video was created and primarily motivated by clicks and the monetary value associated with those clicks. As an ATG_ATT proponent, i prefer riding with good armor.
In my big crash of '21, I did suffer a broken upper left arm, broken ribs, and broken right hand while wearing armor. But the damage to my hip was limited to a large and nasty bruise; I likely would have broken my leg or hip (or both) without armor on my hip. My injuries would have been much more substantial without the armor in my gear. Head and feet were all ok - some might argue my head was already badly damaged
Armor has been proven to provide protection, otherwise the MotoGP racers wouldn't wear it. As with helmets, proper fit and placement is important to how it performs.
I did remove the back armor in my jacket and replaced it with an armored vest with better back protection and added chest protector. Alpine Stars developed this to be worn under a track suit and it easily fits under my RevIt riding jacket. CE2 chest and back protection.
https://www.revzilla.com/motorcycle/alpinestars-nucleon-flex-pro-protection-vest