As a speedrunner myself (though I do completely different games - those from the Hitman series) I'm absolutely astonished at this run. I wouldn't pay no heed to people saying that this run is just short of putting DebugMode 1 in; whatever has been shown on this video is very impressive and educational (in terms of learning the game mechanics for sure!).
I really hate that sentiment people often put out towards speedrunners, that their way of playing the game "ruins the atmosphere/the way it's meant to be played". It's obvious that to speedrun a game you have to already know it pretty well and, most importantly, enjoy it - and not just soullessly crunch it. He's a fan and we should respect that, aye? Those glitches aren't exactly easy to pull off and the fact that people are there to dig out all this stuff only prolongs the longevity of the game.
Very well done, I'm going to follow your stream!