just from looking at it, I can tell you they were not paying attention to physics when they built this
This is why you need engineers and not just designers
Edit: To specify, you want to keep the center of mass low for a motorcycle as it helps is ride stability and turning. If you add something this weighty above the general CoM, you would need to add some heavy weighted objects below to even it out. From the video, it doesn't look like they did this.
You can even see how the bike handles, in the vid seems way more wobbly than you would expect a normal bike to be