Seriously? Is there proof of this?
The body panels are pretty thick, and they're made of an austenitic nitrogen steel -- a modified form of 316LN -- which should perform nearly as well as any "armor grade" steel alloy. (Against steel fragments, it likely performs poorly, but against lead handgun rounds it is likely even superior to the average high-hardness armor steel.) Just on the face of it, I'd expect the Cybertruck's body to stop any threat up to .44 Magnum.
People sit in a Cybertruck. With their head visible through the glass. Non bullet-proof glass.
e.g., https://www.youtube.com/watch?v=vQ5EyKMqGGI
https://www.youtube.com/watch?v=hOteg0J5teg
Do you have links to those videos where it fails?
Besides, 9mm and .22lr are very different things. .22lr is one of the very weakest ballistic threats. 9mm has much more mass, usually more velocity, and a much higher (~3x higher) average KE load.
I do know the difference between the calibers though, having shot a few different weapons in different calibers (as a hobby & in the military)
We were also promised micron panel gaps. the panel gaps on the cybertruck are both visible and visibly uneven.
It's really weird to see anyone even imply that the Cybertruck has vindicated Tesla.