Have you watched the video? It’s pretty jarring. The treadmill doesn’t even stop when the kid caused the tread to stop because his body was so wedged underneath it. It just kept trying.
https://www.youtube.com/watch?v=eNlX4VaN2bU
Which, again, is why there's a magnetic safety key that takes seconds to remove so that something like this doesn't happen.
This goes right back to my "designing for the real world" point. If you are designing and selling a "at home" treadmill, you have different use cases, risks, concerns than designing one for a gym.