I feel like having wheels this wide is "cheating" and it's no longer using the same balancing principles as an actual bike.
It's not immediately visible how that thing stays upright. I assume he has some sort of kickstand he can deploy without getting off the bike. It also looks like the frame might act as training wheels keeping you from going over if you stop.
Tricycles have two wheels at the rear. This is more like having a sidecar on a motorbike (which we still call a motorbike - with sidecar), you can see the second seat on the outrider.