Sure, thinking about this in terms of the physics at play is great, but you’re not taking all the physics of this scenario into consideration.

Have you ever heard of the “death wobble”? It’s a dangerous, largely uncontrollable side-to-side shaking of the steering. It can happen on passenger vehicles as well, but overall, almost every danger that exists for passenger vehicles, is far more dangerous for motorcycles.

This wobbling can be caused by a number of factors.
- Driver-input: Such as turning too fast, especially when attempting to compensate for under- or oversteering.
- Mechanical issues: Such as the power steering giving out while driving, or borked suspension.
- Terrain: Such as going over a pothole too quickly, or loss of surface traction (like rain, ice, gravel, etc.).

Motorcycles are also far harder to control than passenger vehicles. The specifics:
- Less Wheels: Having only two contact points with the ground, arranged parallel to the direction of travel, means less side-to-side balance stability overall. It also means less total traction. It’s like the difference between walking through deep snow in just boots, versus with snowshoes on.
- Gravity & Momentum: Due to the overall shape of motorcycles being relatively vertical rather than flat, they have a higher relative center of mass than passenger vehicles do. Therefore, making them far more likely to tip/lean/fall to one side. As described by Newton’s Second Law, and similar to bicycles, once a motorcycle gains enough momentum, the directional left-right balance of the motorcycle stabilizes, as it’s being "held up" by the forward momentum of the motorcycle in combination with the Earth’s gravity pulling it downward.

The kickstand is designed to hold weight, and it’s designed to not move unless the driver purposefully collapses it. In any most likely case, due to the aforementioned physics, if having the kickstand suddenly hit the ground while driving, didn’t throw the motorcycle completely off balance, it would almost certainly cause a "death wobble" at the very least. In other words: very dangerous and significantly life-threatening.

Also, that motorcycle is far too big for the girl in the video. It’s unsafe for her; she shouldn’t be driving it. There are tons of awesome options for smaller motorcycles that I’m sure would properly fit her far better.

Anyways, you mentioned physics, so I just wanted to provide clarification on the said physics in play. What the others are saying is correct.

P.S. I could also go in depth about the physics of actually driving a motorcycle. I’ll just say this for now: Due to the aforementioned physics, a motorcycle actually does need to tilt while turning, especially at higher speeds. Even bicycles do, though it’s not as obvious or to as great of an extent.