Please look at the clear photo on flickr and not the fuzzy one shown in the article. On the clear photo there is no doubt that's Sky. There are also photos of the two children together, with Sky wearing that same outfit and M right next to him, and orange back sticking in the back of the stroller.
Okay, I've been through those pics and I agree. There's one of him in the stroller with M hugging him, same outfit, same way he "fits" in the stroller.