My wife watched that video and she confirms that I have done a wheelie to that same extent numerous times. My Ridgeback with the Bandit clutch and the new cobra rear tire running 28-30 lbs of air will EASILY power first gear up and shifting into second comes up fairly easy as well without any abuse. My old Venom tire would just break loose and spin if I tried to pull the front end up, but since I installed the cobra tire, it is very difficult to break it loose. Actually if I take off from a stop and spin the tire just slightly, almost always if I am in the throttle hard going into second it usually catches me off guard and the front end coming up quite high like in that video.
The important thing is for the wheelie to also power out of it, as to not slam down from just letting off the throttle. Letting it just slam down on a chopper will for sure prematurely wear out the forks.