there's a slight bug with the links from what I've seen on youtube's part. The guide is comprised of 3 videos and if you click on a portion that's on another video and it doesn't go straight to that part, that other video will have a menu at the beginning too and you'll have a smoother transition from there.
So if you're on the first video and you need help on a Hollow Bastion mission, you click on hollow bastion, it might take you to a random point in the third video which is where the hollow bastion guide is. but that third video will have the same menu the first one did so if you click on hollow bastion from there you should be fine. Sorry for the inconvenience if this happens but I couldn't really help that.