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I found the line
I did it
Then it says it's corrupted so to goes the the backup save
So I edited that one
same result
Then I edited the 3rd backup
Then it deleted all my progress, so I rebooted my old save
$HOME/.config/unity3d/SUPERHOT_Team/SHMCD
Although I have no way of knowing if it is the same for everyone, every time I have tested in the past the string is always in the same place and contains the first V in the save file. So if you can't find it, I would recommend trying CTRL+F and searching for the first V, which should be the one to change to a H.
If it dose not work for others I can only apologise and hope I have not wasted too much of your time. :(