It is not doing photogrammetry and it works on a single image. It has learned what people look like (and training may have used photogrammetry in some way) and

It is not doing photogrammetry and it works on a single image. It has learned what people look like (and training may have used photogrammetry in some way) and it can imagine a good 3D model from even a single image. The last line of the abstract: “We demonstrate that our approach significantly outperforms existing state-of-the-art techniques on single image human shape reconstruction by fully leveraging 1k-resolution input images.”