I only fly in X-Plane, a simulator, but it's IFAA certified unlike MS Flight Sim and I reckon a sane pilot would be up at least 5000 ft to perform a barrel roll in any aircraft of that size. The plane was unpressurized too according to the audio but doesn't the plane rigidity rely upon the cabin being pressurized? So likely the plane would have broken up during the manoeuvre. Also on the audio there would have been TCAS warnings for the other planes so close, proximity warning alarms and vocal terrain, pull-up warnings. It would have been chaos in the cockpit with alarms.
Best one yet anon!