That bit was important to include in the video in my opinion because of the circumstances.

He didn't break his computer while messing around with the kernel, changing system settings by recklessly copy&pasting random commands he found on the internet. It happened while trying to install a very popular software from the distro's official package manager, following what's otherwise standard installation procedure. A lot of people broke their systems the exact same way until that bug was fixed.

We all like to pretend Linux is "there", but it was a clear and important example of how it's not really. Because the user is dumb and the user has no idea what they're doing. At least that's the core assumption an OS should operate under if it is to be used by anyone and everyone. You can't claim even your grandma can run Arch when trying to install Steam can bork your system. And no, warnings are not a valid defense in this case. You will never teach the average user to not ignore those. Unfortunately it's the OS's job to protect the user from their own recklessness, and again, warnings are not always enough. Especially when you're getting warnings while doing something so mundane.