WOW… it is amazing to see this. I have done a mouthpiece buzz/lip bend video for the Allegro Status Stage very much on the same path, simply with a little more focus on process and making sure those negative habits don’t creep in.
The exercises in the above video are valid but very advanced so be sure pure process is adhered to.
One small issue I have is the idea of the “press the lips together against the accelerating air”. This can create a false psychology of range vs volume and the whole Singing C series is to eliminate the desire and/or need to push the air to change pitch.
By all means continue but have that magnifying glass out 🙂