It looks like a weird crop. The DoF is likely really shallow on the camera due to mediocre lighting, and if Biden were actually centered in frame, I could see the rest of the image being softened like that. If you look at the guy in the top left, he looks a bit stretched out diagonally (lens distortion, they didn't post-process the image well) but the other 3 corners aren't suffering from it.
It looks like a weird crop. The DoF is likely really shallow on the camera due to mediocre lighting, and if Biden were actually centered in frame, I could see the rest of the image being softened like that. If you look at the guy in the top left, he looks a bit stretched out diagonally (lens distortion, they didn't post-process the image well) but the other 3 corners aren't suffering from it.