It doesn't work for the vehicles already implemented AT ALL. Feel free to pick an Ostwind and place cons behijd a stone wall and test by yourself how wall soak tons of shots
Fun fact: the supposed no hit "ground or object" magic trick has already been implemented for raketen (i know it is depressing)
From changelog:
Raketenwerfer
The Raketenwerfer has been adjusted to be less potent at veterancy, but more reliable and more difficult to lockdown by HMGs.
Projectile no longer collides with terrain
"No longer collides with terrain". Except for ground/dirt, grass, bushes, trees, fences, branches, dead cows, tractors/cars, and other small wrecks. Just raketen things.