While growing up in the Amazon region, in a hilly area in and near Manaus, I saw plenty Rollinia deliciosa growing on hillsides, often on the lower slopes. I don't recall seeing any anywhere swampy.
In the few months' worth traveling the rivers, I don't recall seeing any in flood plains either. Of course, I can't rule out there being some, especially as I wasn't specifically inquiring about that--- most of that travel was when I was 9-13 years of age, already working some with fruit trees, but not yet reading horticultural text books.