Uhhhh nope. Ran this wednesday evening, one shot it, no turret respawn, and I hit the button the INSTANT we crossed the field. Tower tank was WAY out. (Hell, last week he hit a mine on the way in somehow. that was funny. We 7 man'd the boss. )
It happened to us again last night. So instead we waited for the tank to get across and it worked. Also, we went back across the mine field before to check, but after the boss was down and they still came back up. It's bugged.