IWhat I've seen from many TKD schools is that their hosinsul curriculum seems to be a collection of counters (possibly derived from hapkido) to various (mostly static, mostly unrealistic) grabs. Often the techniques use an entirely different set of body mechanics and tactics from what is taught in the forms and in sparring. From my standpoint as a grappler, the execution and understanding of these techniques is often... not very impressive. This would be a typical example of the sort of stuff I usually see:
I only watched about 1/3 of the video, but from what I saw, I'd say they were pretty much 100% ripped from Hapkido. I'm guessing the person who put this curriculum together studied Hapkido for a year or two, but the guy demonstrating the techniques doesn't entirely understand the techniques and is often muscling through a technique that should be relying on leverage.