I believe what makes that video particularly strange is that they are discussing the events unfolding as if it was a sports outing. "The angle is important there", "I don't always get that one", "I messed that part up, I usually get it right." As if they regularly make it a night to explore and exploit the glitches of their cherished childhood memory of a video game.
There can be a fascination in breaking down things you're familiar with, to see them corrupted and perhaps even a sense of discovery, achievment in breaking down barriers the game never intended you to do. But I honestly can't find the appeal in making it into some sort of past-time. I'm sure somebody finds it fun. Personally, I never could. If anything, it's actually kind of eerie to me.
Especially for something one is fond of. You're breaking down everything about that world, everything you really fell in love with. You unravel it, turn it into data, strip it of those illusions of an actual world inside of that cart and dick around in this ghost town of a game. You'd think eventually you'd be so accustomed to it that this "fake world" that the game would no longer really mean anything, which makes me wonder how anyone can keep an interest. But I suppose some kinds of people just… can play Super Mario 64 a million times over and never find it old?
Alongside exploiting glitches, getting through to lost areas, or rather lost and unfinished design plans left in the game, is a bit unsettling too. That whole idea that you're seeing into and exploring these places that you're not really "supposed" to. So the fact that there's this whole community of people that do nothing but dive into it is kind of bizarre to me, if not completely understandable. But how they can focus so much time on one game. You'd think it'd feel a bit lonely, after a while.
If you've ever played LSD and actually played it, just exploring and immersing yourself in it naturally, it's kind of like that. That sort of incomplete and undesirable eeriness.
P.S. the water in Zelda 3D games, as well as a lot of early polygonal games, also reminds me of this sensation, in how they have a low draw distance and a lot of darkness.
P.P.S. were we talking about speedruns or something gay