Again, not sure if this turned out to be correct; but from reading reports on the ground and the lives Israel claimed it saved (and building more of them,) it seems evident he was in fact wrong.
He seems to be just a theoretic, not an actual military nor weapons manufacturer. From the start his pondering about unimportance of hitting engine instead of warhead is already very wrong and very theoretic. It is also very theoretic wish to hit the rocket frontally, I mean it would be great, it is a wet dream of any air defense, yet on practice hitting sideway chasing from behind is more realistic and still works great usually.