Am reading the "Bloody Shambles" series and have read about this guy. I am not positive, but think there was a bit of embelishment in his totals (as with everyone else). Some of these guys were double claiming or just claiming everything they shot at. Claims were especially high on missions where the bombers they were escorting got clobbered or when Allied bombers really pasted the target. Probably human nature to embelish your victories when your side has a bad day.
Problem was also encountered with the Allied Pilots in Burma. They'd come back with claims of 10 planes shot down and records would show 1 destroyed, one damaged beyond repair.
In short, take the totals in Burma with a grain of salt. Most of the aircraft destoryed out there seem to have gone down from ground fire, mechanical failure or were bombed on the ground. Air to Air was the least of the threats.