I think your times are a bit off...
Here's the problem, individual working parts mean nothing if the entire sequence is wrong. For example, by "22" I'm assuming you're talking about the arm lock he performs on the guy he's rolled over? Well that's all fine and dandy, except that the roll he performed to get to that point (before he said "bridge the body" ) is laughably wrong. If you attempted that with someone on top of you, you would either not go anywhere and eat fists all day, or your assailant would allow you to roll over so that they can choke you from behind. The "bridging" that he does is lifting his hip and simply rolling to his side. That isn't how you're supposed to bridge. You're supposed to bridge at an angle. Rickson Gracie explains exactly why you shouldn't bridge the way Hatsumi is bridging here;
You should really watch the whole thing. It's a clinic on that technique, but the part I'm talking about starts around 3:30.
Further, you typically don't start bridging until you've trapped their leg so that they can't base out. There was zero attempt at that in Hatsumi's vid. The guy on top actually purposely trapped his own leg as Hatsumi rolled, which is absolutely ridiculous.
And that's really the problem; The point of the Hatsumi video is showing Ninjutsu counters to the mount. If the mount escape itself is wrong, everything is wrong.
I agree - and that's a great video. One comment: those bridging movements aren't entirely ineffective, if the attacker isn't trained in ground fighting. Those are the kinds of movements I learned first, and I was able to successfully combine those with my understanding of body mechanics to roll with some folks who were trained. I wasn't nearly as good as I'd hoped (as I said, I was using mediocre bridging techniques), but the opponent wasn't Rickson, either. If your timing is good and you have enough other tools in your kit, even weak bridging can be useful.
That said, I've loved upgrading my ground work over the years and getting a better understanding of the mechanics down on the ground. One of my laments is that I can no longer do much of that stuff - my knees and feet are pretty much constant pain now, so all of my ground work is just escape and stand.