Your friend is right that there is only one airfield but there are still some undiscovered Airfields, LOL

Here is the location of the other airfield between Wakra & Mesaieed.
If you are going from Doha, go past the Al-Saleem Petrol Station, take the next available U turn, and drive back for about 400 meters. Then turn right (there is a small board identifying the fully paved but small road as "CP-14"). Go about half a kilometer, and just before the road ends at the QatarCo yard (large walled compound), turn right again into the desert. Drive for about a kilometer through the unpaved tracks, and you are at the field.
Lots of action on Friday mornings, starting around 5am. Sporadic on other days and evenings.
(This info is from the admin.)
Cheers,
Fernie