The BBC article does not mention “the most widely circulated speculations”.
It lists “some of those theories” which are far-fetched and then “the even more far-fetched” theories.
Actually most items on the list aren’t even theories about what happened or who ought to have made it happen for whatever reason. They are just just random ideas on either location, specific events, or general direction of the plane.
On that “some far fetched theories” list, the explanation of Goodfellow looks favorable but is not undisputed.
