The article I read had a stock photo of a phantasmal specimen, but the photo of the actual frog was taken from a distance and you could only see its bottom. It didn't look like any dart frog I've ever seen.
It's like a few months ago down here where the front page story showed a large rattlesnake that the animal "rescue" people had stabbed through the head with a gig. They claimed it was 12 ft, and then 15 ft, and the last version I saw making its way on the internet had it at a world record length of over 18 ft. The photos were taken using to old fisherman's trick where the snake was held towards the camera much closer than the guy holding it. Based on the size of the gig head (we do a lot of flounder gigging down here), my guess is that it was around 8 ft long - a big snake for sure, but not big enough for the front page. I was bummed that they killed it. That snake was probably 20+ years old.
My point is that the media loves it when something poisonous or large came "inches away" from killing someone and they whip up the exaggeration frenzy to appeal to people who thrive on that stuff who will shout you down when you get all scientific about it. Oh, and one of the guys holding it might have actually been Elvis Presley.