I think the author is excited because he found the plane in roughly the area he expected to find it if she was thrown off course by an instrumentation fault tha

I think the author is excited because he found the plane in roughly the area he expected to find it if she was thrown off course by an instrumentation fault that occurs when crossing the international date line. Also, it was about the right shape. Also, it wasn't near the fighting in WWII, and the shape doesn't match that of WWII carrier aircraft. I'll be more excited when they get out there with a deep sea probe and take some photographs.