it is indeed made to look like its impossible, though there are actually multiple ways to get past the turrets, though you wouldn't expect most of them; look at some replays to see how others solved this.

Trigger detection areas can be animated just like any other object. For instance, if a trigger zone contains everything to the left of the turret, the turret can be made to turn left to aim at you. The trigger zone can rotate with the turret, so it will stop turning (or turn back the other way) if it turns too far. The same can be done for up/down.

I have two things, first, the level is impossible. I tried for around fifteen minuets trying to beat it, but failed every time. Second, how did you do this? Just wondering.