I'm assuming you mean moonwalking. I just got on the PTR and tried to moonwalk on several different characters and I could not do it. Not sure if this is just a PTR thing or whatever but it doesn't really matter since moonwalking was never really real anyway. The server never classified you as facing backwards -- it just looks cool.
Backstrafing, on the other hand, I think more of simply jumping back and forth toggling between your 'e' and 'f' strafing keys which still works and really can't be nerfed since it's just how you jump and turn while in midair.