Very few videos are as explicit about where and how to turn on the bumps, for beginning bump skiers like me:
What do you guys think is the proper progression from never skiing bumps to learning to ski them? A defined goal on where and how to turn is critical to me.
There's quite a few short vids - the ones you posted, the ones by Alltracks Academy "How To Ski Bumps (Parts 1 ->3) - that discuss line. Those short vids are mostly intended to promote a ski school or a course so they aren't a comprehensive how-to manual.
There's longer vids such as Lito or Section 8. The Lito one is available free and would have been handy to have in 1985. I do find the slo-mo skiing annoying - there's not one second of that vid at normal speed - and it makes things look smoother than they really are. Also, IMO the section on absorption/extension should be up further to the front as it is a key skill in handling the bumps. IMO the Section 8 vid is the probably the most comprehensive but you have to purchase it.
A few issues learning from vids:
1. Any item of advice may not be what you most need to progress at that time
2. There's no feedback on whether or not you are doing something correctly. And if not, how to adjust.
3. There's no-one demo-ing for you in the situations you encounter. The vid doesn't know if you are skiing hard packed icy bumps or ones covered by 15cm of pow.
In terms of where to ski in the bumps that last item can be very important. At times it's very useful to follow some-one skiing at just the right level - not having to think about where to go frees the mind up to concentrate on other aspects of skiing.