When I was in college as a 40+ years old-fart student I met some extreme kayakers who did the Lochsa at high water every year. I ran the Beartrap Canyon with them a few times but always found an excuse not to go the Lochsa.
One of those guys was among the first to drop over Kootenai Falls in a kayak. And live. The most extreme thing those guys did--every year--was to run the Clark's Fork of the Yellowstone Canyon. They spoke about it reverent, almost religious terms. When I was in high school the Clark's Fork was said to be "not runnable."
I paddled the Gallatin Canyon with those guys (and gals) a few times too, although I got out before House Rock and they didn't. Every few miles down the river they would all get out and huddle around in a circle to pass beverages around. And to talk about all their old friends who had "died in a freak accident."
That told me something. On that video above it was interesting to see the Creature Craft tumble around too. They always seem to bounce back upright again at some point. But they seem to go over a lot too.
Photos of supposedly self-righting ocean rowing dories like this one make me wonder about a shorter, much wider version of the same as a self-righting white water dory.