The only point she conveys in that video worth sharing, is the concept that heat travels back along the torch tube towards the valve and tank. When you use one of these to anneal cases, that is different than soldering for plumbing because the torch will be on long enough to make it an issue.
Using a larger tank and distant regulator does two things, it keeps the gas in the tank from warming up and changing during your session, and it also keeps the regulator out of that heat.
You will want to keep an eye on flame operations since the heat traveling back down the tube will eventually change the flame as it affects the valve and fuel.
The video is otherwise just cute and doesn't convey any of the flame front or valve setting concepts at all.
If you flame anneal, it is best to be taught by an expert. You can do this on your own but it requires feedback. You are either going to want to watch your seating force, or submit samples for hardness survey.
If you do this blind and get it right, that is great and carry on. I know folks who got it right by luck without feedback, so it can be done.
If your results are making things worse, try watching the seating force or try to find a lab to submit samples. YMMV