Only the OGs will remember when Steam would sometimes rm -rf /* your system. https://github.com/ValveSoftware/steam-for-linux/issues/3671
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He was doing it while recording a video with his phone, literally installing steam as the first thing on his PC, he didn't expect anything like that to even be possible. He probably thought "ugh whatever just finish this download already I don't care about your permissions"
Plus he only had to write "yes do as I say", he didn't read what came before.
Here's the moment when it happened: https://youtu.be/0506yDSgU7M?t=609