When learning a new speedrun category for any game, always check the upload dates on the videos you use to teach yourself. A lot of the available tutorial videos are usually outdated and the route has more than likely been changed since then.
It's best to use a recent run by a higher level runner for learning a new category, since their most recent run is more than likely going to utilize all of the latest tech and routing. Recent runs can always be found on the category's speedrun.com leaderboards page.