HI
Yes it was the AA RTW Desk that have told me and quoted that rule - which is still on the Rule Sheet I believe and at face value does seem to exclude MPM DOH LHR etc

I want to do MPM-DOH-LHR/SYD-WLG-SYD-SIN-HKG-ORD-BUF-PHL-BDA-JFK-YVR-LHRxJNB

They've told me I have to MPM DOH SYD etc and can stopover in LHR at the end of the trip
OR I can MPM DOH and stopover there and transit London at the end ...