I got to this level as well, and failed, mainly because I though I'd have to fight him after the timelimit, but I was wrong.
Anyway, I don't know if the patch screwed up something, but I can't do the level again, I have a save that is right before you get to the tiger tank and all my guys are alive (And I'm on HARD). When I go to the tank it loads the VOID, but it seems to bypass the medic level everytime now.