The guy that did this video needs to review this thread:
Altitude vs. Barometric pressure
He needs to stop making generalizations with altitude, and start measuring/using actual air density parameters: absolute pressure, temperature, relative humidity.
These directly affect both BC, and MACH (which again affects BC per velocity)(Mach is temp and Rh).
Drop compensating gimmicks are already compromising to accuracy. You don't need additional errors on top of it.