|read the coverage|
There must be something wrong in science if the NewScientist published this weird coverage on massive photons around black holes.
First, even my grandma knows that "black holes tend not to exist" [cit.], so that putting bounds on the mass of the photon using observations of supermassive black holes, as the author apparently do, doesn't sound very likely.
Second, I know personally most of the authors and at least one of them is dangerously close to be a crackpot, to be polite.
Thus, i strongly suggest you not to read the original paper, or to read it just for fun, and never ever trust those authors!
Btw, if you are not disgusted enough, here you can find another view on the problem.