The smooth power delivery and progressive clutch of the CB help a lot I'm sure. I did a slow speed handling course last year (nowhere near as good as this fella) and the big takeaway item is looking where you want to go. Look where this guy is looking in your video, where he wants to go and not where his front wheel is currently pointing. At some points his head will be at 90 degrees to his body. I rode the Dolomites over Austria, Switzerland, Italy and Slovenia last year, a million hairpins. (OK, slight exaggeration) and that head position was invaluable. I was heavily loaded two up and I never had a problem.
Check out this fellas YouTube Channel, he videos riders falling off on the Stelvio :-0 Some of these slow speed crashes will make you cringe!
http://youtube.com/shorts/Jzz9tFZf5m4?si...jaSiMk_98T