The video is kind of interesting if you understand what's actually being shown.
The gentleman on the left understands the techniques well enough that he is able to allow his partner to get most of the way into the wristlocks and make some very subtle micro adjustments which prevent them from working. The person on the right only understands the basic shape of the locks and so doesn't have the sensitivity to feel how to counter the counters. Contrariwise, when the guy on the left applies the techniques, he understands the subtleties of directing the force exactly where it needs to go.
The claim that one method is "mechanical" while the other uses "energy" is misleading. It's all mechanical. But referring to the more precise version as applying "energy" may be an accurate description of how the difference subjectively feels to the practitioner. Sometimes when you learn to make the subtle adjustments necessary to apply or defeat a technique, you just feel it kinesthetically and it takes additional thought and analysis to break down exactly what the mechanical differences are. Not everyone is skilled at or has the inclination for that sort of explicit analysis.
From a teaching standpoint, it's good to be able to analytically break down the mechanical details but it's also good to be able to describe the internal sensation (i.e. "energy") associated with those details, since some students will grasp it better one way than the other.
I can sort of do the same counters that the instructor was demonstrating, but I wouldn't try demoing them against anyone who was really strong or particularly skilled in the locks, because my wrists are both arthritic and have bone spurs, so my margin for error before the pain kicks in is pretty small. I might use the same principles to try escaping the lock if someone tries one on me in sparring, but my wrists just aren't healthy enough to hang out indefinitely in a compromised position while someone cranks on them.
As far as the techniques themselves, I'd say that they're valid but very situational. I could see them used in a bouncing/LEO/CO context as a sort of grappling "sucker punch" against a subject who is non-compliant or who is pre-fight posturing but hasn't started actually swinging yet. However in that case there are a number of macro adjustments (getting offline, disrupting the opponent's base and structure, etc) which are more important than the almost invisible micro adjustments.
In an actual fight or sparring match with any halfway competent opponent who is actively attacking, you are unlikely to complete any of those locks. However sometimes the opportunity presents itself to use the threat of the lock to force a reaction, which you can use to improve your position. I don't know that those opportunities come up often enough to make it worth devoting a lot of time to training the locks from a min/max perspective, but it's an interesting option to explore.