A collection of unusual and sometimes unique machining methods.

[metric_taper]

Your years of skill, and amazing geometry transforms, thank you for sharing.
Maybe AI will take your video, and incorporate it in future G-code compilers. That should be fun to see when a new machinist runs it for debug. That inside cutter trick, so much less movement of the axes.
I have used the long tangent cutting trick to remove material like that, but seldom have the right cutter for general use. I'm a manual guy only.