For anyone with questions, here's the link to the
site with those pictures, and the accompanying article.
It sounds to me like they're just guessing as well. Their "evidence" that it's a Camaro is that the rear doors look fake and the chassis sticking out the rear looks like the Bumblebee. Let's not forget that the Bumblebee was actually a GTO with a Camaro body and not an actual Camaro.
Now, don't get me wrong, I'm not saying this is or isn't a Camaro mule. I assume that someone who makes a living taking spyshots of vehicles would certainly know better than I.