It's funny how certain they are this is it, while people with competing theories are certain that it's not. It'll be interesting to see if they'll be able to get a sub down there to investigate.
Also, it's not mentioned in those articles, but I read a different article about this yesterday that explains why they searched in that area - the "Date Line" theory. The thought is they might not have propertly adjusted after crossing the international date line, which would have created a 60 mile difference with their destination that would have put them in the area the search was conducted.
https://www.yahoo.com/tech/astonishing-ocean-discovery-may-just-133000261.html