The airbag video was interesting but I noted there was no engine or forward crash visible just a bag deployment.
A twin is far safer in a head on collision than a single.
The biggest killer in a single is the fact that there is little to restrain the massive block of the engine from coming back through the firewall into the cockpit.
In a modern car the engine is directed down away from the passenger area. Not so in a light aircraft.
For that reason the airbag while a great addition is not going to help much against a few hundred pounds of solid metal joining you in the cockpit at 30 mph plus.
Pace