Correct. The buildings in the Magnolia Bend section have only 2 floors so no elevators. The buildings in Mansion section have 3 floors so they do have them.
We stayed at POFQ and requested a first floor room because of the stroller and they obliged. I know that is not a guarantee (since there are a million strollers) but it cant hurt to ask (even with elevators, 1st floor is nice )