Why do you claim that rotary wing isn't GA?
Only because there is a forum here called Rotorheads, so it would be natural to assume that heli pilots go there and FW pilots come here.
The AAIB remark was squarely in the FW GA context.
Actually my GF just reminded me of something. Shouldn't somebody ask the AAIB for data supporting that assertion? Such a respected body must have supporting data for everything, surely.