I don't think it's assissted. We are talking of a 113kg HE warhead hitting at high speed. That's half a Harpoon and roughly a NSM. And look at what that did to the target ship in the video.Assisted...
A few drums of fuel/C4 strategically placed go a long way...
Sometimes just having your missile actually work as designed isn't enough for domestic consumption...
I think the Burke didn't arm the SM-2 it fired at the sinkex in order not to sink the target too early.