The video is the same garbage that was promoted when we first started having the conversation on pprune.
Note the first action is to apply full power with collective - if you are any deeper into VRS than the very early stage, that alone will make things much worse very quickly.
It works on the Vuichard video because he is never in anything but the very early stages ie he has low speed and a building rate of descent.
According to Nick Lappos, if you have enough power available, you can power out of full VRS - but that takes so much power (to overcome the drag from the vortices) that most helicopters cant do it.
Come on AnFI show the actual figures for a 2, 4 and 6 ton helicopter doing 500'/min, 1000'/min and 2000'/min since you like the maths so much.