They call it a “humanoid skeletal structure”, and then say that it might be a giant eel skeleton. They must have a rather interesting idea of what humans look like.
Given the rate at which bones decompose, if that is a real skeleton it could only be a few decades old (50 years at most). If it was fossilized, then it could obviously last longer; however, it is a lot harder to get DNA samples from fossils than from actual bone, and these people were able to get enough DNA to tell that it wasn’t anything known (which means that they were able to get quite a lot of DNA). Now, I’m sure that there are lots of previously undiscovered animal species in the ocean, but you’d think that one that was 200 feet long would be a bit noticable.
It is also rather interesting that they found this skeleton at a depth of 190 feet, considering that the ocean floor where they have it marked is over a thousand meters deep. . .