Well, if this IS CG, the background "plate" would be the pic taken with the cellphone, which would retain the EXIF info, so that doesn't prove
anything. The "object" is compositied into the pic taken with the cellphone. The entire pic isn't fabricated, just the object.
The lighting info is very essential in matching the 3D object with an environment, and since the person taking the pic is probably the one making the
object, they would have the "set" light info to match the object info.
The object is rendered in a 3D app with an alpha channel which essentially isolates the object. It gets "plopped" on the photo. Then it gets
"blended" into the scene. Sometimes the object is rendered in passes, so each pass can be altered. One pass might be a shadow pass, so the shadow
can be altered independent of the object.
Just saying that's how it would be done if it WAS a fake.





Anyway if all this turns out to be true I still think it's man made.