2.7 g would roughly need 1.6 times stall speed.
Given short time and only 220 feet: I doubt the data
The airplane was "turning". Don't so quickly dismiss the possibility of an accelerated stall, maybe due to momentary overbank...
An accelerated stall while in a bank at 300 ft AGL, and a recovery at 82 ft? With enough airspeed to pull 2.7 G in the recovery? I, too, find this dubious. Wind shear, that I could buy. Especially considering the location. A stall, not so much.