I think that the cleaner you eat, and by adding moderate cardio, and of course pushing the iron, that eventually the stomach fat says "see ya"
I don't think any amount of situps, crunches, etc. will do much of anything without diet being spot on. I see folks in the gym blasting away at abs for hours and getting "0" results. Sadness for them. They expect some kind of miraculous "spot reduction"
I do believe that if you have bodyfat down in the single digits that you can keep new fat accumulation in an area that is considered to be the least active area on a man. That might have some credence to it, but then I would have to question how one gets rid of low back fat...
Full body compound exercises, clean food (mostly) and some aerobic activity will get you some kind of abs.