"The stunt by Tesla by shooting a .45 caliber bullet at the cyberpunk doesn’t prove it’s bullet proof.

A 45 is a low-velocity round with a very large blunt nose.

If they shot it up with an ak47 round or a 5.56 out of a AR15, they would have made Swiss cheese out of that door panel.

There are many high-velocity pistol rounds that would do this also. One is a 5.7mm or a .22 magnum."

from that same article