Yeah, that's the problem with water cooling: when things go wrong you get a steam explosion and your PC is just deleted.
Is this the famous "installation bug", when the program sets the root of the filesystem as the "installation folder" ? Happens a lot.
Note that though the video is new, the bug happened 9 years ago in 2015. And I'm pretty sure it was fixed quickly, though I didn't immediately find the fix commit when I had a cursory glance at the github issue, because there were so many drive-by comments from the time to wade through.