I have tried the experiment off-line, and was able to first wond the Tiger, then kill it. Yes, it took quite a few shots, but event the drone T-34 took a number of shots to kill. I'm not sure the off-line tank drones have the same toughness as the actual on-line tanks. After all, the off-line drone planes don't use the real damage model either, at least as I understand it. In any event, Tigers will only be enabled at 2 bases, and those two don't have remote spawn points, i.e. they're completely defensive.