She didn't do the install, she just encountered a pre-configured system that wasn't working properly. The documentation for vim and tmux is extensive. If you sit down to "RTFM", you're going to disappear for a week or two, and you probably won't even realise it when you read (and then forget) the bit that you actually needed.
Honestly, if you are not impressed by this piece of bug hunting, you are either an absolute genius, or someone without enough experience to appreciate just how difficult what she accomplished actually was (note the elegance of the solution - simply applying a symbolic link). I'm going to go with option 2, because I would already know who you are if it was option 1, but I don't, you're an anonymous internet 'nym.
Honestly, if you are not impressed by this piece of bug hunting, you are either an absolute genius, or someone without enough experience to appreciate just how difficult what she accomplished actually was (note the elegance of the solution - simply applying a symbolic link). I'm going to go with option 2, because I would already know who you are if it was option 1, but I don't, you're an anonymous internet 'nym.