The only reason I can see would be an interpretation of:
Only one intercontinental departure and one intercontinental arrival permitted in each continent except as follows:
1. Two permitted in North America.
2. Two permitted in Asia when one is for travel between the Southwest Pacific and Europe/Middle East.
3. Two permitted in Europe/Middle East for travel to/from/via Africa.
If travel is to/from Europe in both directions, itinerary may not include Mauritius/South Africa.
that the entry to the Middle East "for travel to Africa" means that it must be a transit, otherwise it would also be for travel to DOH.