In that article, and the snopes article it links to, it is implied that it is illegal to even take the picture. But then I fail to actually see where it is implicitly stated that it is illegal to take the picture. I can understand the copyright claim on publishing said photos, because that's actually the case for lots of things that can be viewed in public, but not taking the photo itself.

I really wish articles would refrain from potentially untrue clickbait headlines, but oh well.