Please do not give that guy more exposure than he already has, his advice is going to get someone killed one of these days. He knows just enough to be dangerous.
I would strongly disagree. Inexpensive batteries are everywhere now - this is the work of market forces, not some guy on Youtube - and he's one of a handful of people who you can trust to do an honest dissection of a battery. You don't have to be a rocket scientist to check for a handful of basic safety features and characteristics, which is more or less what he does.
Will Prowse has been around a while now and this is the first time I'm seeing a critique of his safety habits. Please elaborate as he's widely respected in the solar/storage community.
Given how many years of experience we have with Will Prowse, it would be helpful if you could elaborate a little on why we should trust your opinion more.