I did watch the video. The wheel conversion kit looks like a neat performance enhancement, and possibly a useful way to convert to all electric.
But the guy in the video is a salesman, and stretched the truth in several places, as have some of those touting these conversions.
In the video, the cost of a 2 wheel conversion is given as just under $10,000. And estimated that a rebuilt Prius battery would cost $2000-$3000. So even without costs for the little odds and ends of nuts and bolts required to tie cables down and bolt pieces to the structure this isn't an under $10,000 dollar conversion. Not necessarily a deal breaker, but once you have stretched the truth once, everything else you say is suspect.
Installing in an hour seems like a miracle to me. That sounds like plenty for removing the old wheels and hubs and installing the new hubs, but getting the holes cut for wiring, bolting in the control boxes, connecting to the CAN bus and bolting in the battery just sounds like more than what is left of the hour, even for someone who has done several of these installations. Someone doing it on their own for the first time will be much longer. On the other hand, finishing in a weekend seems very feasible and makes this a really practical, just oversold conversion.
Other issues. This particular conversion doesn't seem compatible with driven wheels and so converting wheels that don't already have a stationary hub will be a bigger deal. But maybe I am missing something obvious. Also requires a newer vehicle that already has CAN bus along with compatible traffic on that bus. And indirect reference that there will be customization fees for vehicles with wheel sizes different than the Honda shown. And the larger diameter brake rotor that makes room for the electric motor seems to require the low profile tires shown. Good for going around corners. Not so good if you regularly encounter pot holes and other road irregularities or value a smooth ride.
Finally. That particular conversion has absolutely horrible gear noise. It dominated the tire noise, wind noise and the noise from the ICE. The salesman tried to convert the wart into a feature by touting the "wonderful turbine-like sound", but most will tire of this rapidly. Also such noise can be associated with gear wear so life may be an issue. The noise problem should be susceptible to more engineering, but the available product isn't there yet.
All in all an intriguing product, but not a magic solution for everyone.