Did anyone else notice those seem to be successive tests on the same car? In the alternator test you see a fastener toward the back of the belly plate gets loosened, in the trailer hitch test you see the fastener actually come out, then in the concrete block test you see the belly plate actually flap under impact, and you can see what appears to be the hole that fastener came from.
I am fairly impressed that, not only did they do real world tests (which do fall short of shearing off wheels and battering through concrete walls) but they apparently did not put the car on a lift and return it to perfect condition between successive tests.
That makes the test a bit more real world like, cars get driven and accumulate wear and tear, so they are not necessarily going to be in factory mint condition when they hit something.
You get the feeling, regardless of what you think of Musk or the car, that he is very proud of that car, and it appears justifiably so. Yes, he is defensive when the press screams disaster and trumpets doom and gloom about the car, but he doesn't ever try to hide from the press or try to spin the reports, instead he makes a change to improve the car, then does his spin on his own terms.
Obviously titanium might be a bit pricey for the "cheap" Tesla when it arrives, but I bet the anti-penetration armor design will be there, even if it ends up being constructed of less expensive materials.
In this way the response to the overhyped Tesla accidents and fires will help us all in the long run, just like the German automakers pioneered crash simulation in the 80s and 90s, and now all cars have crumple zones.