I didn’t watch that video (at work earlier) until just now, and I was a little surprised. This looked more like a trail ride obstacle course, the type of riding that I hope to learn to do (going to an “offroad challenge class” on Sunday as my first step) rather than what I thought trials was. The skills in this video look very helpful for advanced street riding.
When I hear trials, though, I normally think of videos of tall boulder scaling/jumping, like in your avatar, the kind that you would never ever encounter on a street nor hope to do on anything less than a dedicated trials bike. Or those free-style street trials where they ride over cars, pulling wheelies up/down stairs, on top of bridge railing, 8-ft + drop kind of stuff. So there are many different forms of trials?