I think its fabricated. I could see the boat being a possiblity, but as I look at the photo it just doesnt really look like a boat. And I feel like it just doesnt match up with the picture.

The wake doesnt match up as a boats wake. It has a double V. It suggests two seperate boats. And if it was mud pulled up from the bottom it would spread out more towards the end just because the silt would drift.

My guess is it's fabricated.