At the beginning, the page says to watch the intro to animation tutorial, and links to https://www.youtube.com/watch?v=42HKCFf5Lf4 , which is your generic intro to Godot tutorial instead. Just a heads up.
I assume https://www.youtube.com/watch?v=18Em80Bfjp4 was the intended target video
Thanks much, I'm fixing this right away on our side, and the fix will be live with the next update that's currently in progress. It should come out within the next two weeks.