I still think the water and people are still Photoshopped in -- in other words, those people weren't photographed in that pool. And, the water body the people were in, was 16+ feet in INSIDE diameter.

It may be that they put a cut-out of swimmers in an 18' (OD) x 40" AG pool into a photo of a 15' x 36" pool. However they did it, when people buy an Intex 12'x30" pool they won't be able to get real-life friends and neighbors in the pool in the manner shown.