The thing is - it is actually true that Jackson wasn't all that keen to sign for Wigan. Iv heard that fron two ex players and one teammate. There were no firm NRL offers and in financial terms Salford were blown out of the water by Wigan's offer. Leeds wasn't an option as they wanted a straight two year deal with no release clause and he probably hasn't felt particularly enthusiastic about it during his time home in the off-season. Hopefully he'll be fine when he gets over here, enjoy the brilliant facilities and embrace the challenge and opportunity to win something. There's always the risk that he'll half-ass it this year but I doubt it as that wouldn't do his NRL prospects any good. Plus he's always been professional and competitive in his time here.
The journalist has probably heard some of these whispers and taken advantage by putting together an exaggerated but plausible story. There was never any evidence that Hastings was going to be unprofessional and not fulfil his commitments.