You're asking for the source of speculation/rumor in a post to a discussion forum made by someone who isn't employed by the company? I'd say the source is the one who posted it. Or maybe it comes from some HALaska pilots who asked one of our jumpseating pilots if ABX had started training people in the A330 yet.

That said, it's no secret that ABX is doing preparatory work for adding the A330 to their certificate in order to minimize the startup time once they have a committed customer. It seems unlikely that they would spend time and money on doing that unless somebody out there had expressed some serious interest, but maybe it's just that the new ownership has more of a forward-looking spend-money-to-make-money view. It is my considered opinion that it will happen sooner or later, but at this point there is nothing out there that puts a date certain on the arrival of A330s on the ABX certificate.