Horses for courses. These Rockets are not motards, and wheelying a heavy shaft drive is playing footsie with Lady Luck. The stresses on the crown and pinion back there, picking the bike up literally at the end of a stick (the moment lever acting on the shaft), is seriously high. And not putting it down softly will rubbish the fork seals in no time as well. There will be no story you will be able to spin Triumph to explain your way out once it catches up with you.
I own a Ducati Monster specifically to deal with the hooligan streak, and I will not have a problem if anyone allows me to wheelie their Rocket. But I will not be wheelying mine, aside from the odd momentary power wheelie. Like so many journos and vloggers, the clowns in this video do not care to thrash their test rides either - they have no skin in the endeavour, and those bikes are probably sold off as demos to unsuspecting Polish riders anyway.