Once again: he's a top executive whose responsibility, among others, is to represent the club publicly. How do I know that? Because that's what he does (he makes comments to the press, attends official events on behalf of the club, etc).
And he's not doing a good job at it with the comments like that about Marotta. Such comments show only his emotional weakness and nothing more, and since he's talking not as an ex-player, but as a Juventus executive, they show the weakness of the club too. It's called bad PR.
Marotta's case wasn't an exception. He showed similar lack of prudence when he commented Max's possible departure while Allegri himself was giving interviews about how he wanted to stay at the club for many years, and there were other examples like that. But when the Pep rumors got out of control (extensive media coverage, Pep's irritated by the wave of questions, stock price fluctuations) and the club was expected to comment it at least somehow, Nedved, on the contrary, was as silent as a fish.
I never claimed to know the full list of his responsibilities or that he's completely hopeless at anything he touches as a manager. I wrote that he lacks important executive skills (communication skills in this case), and that is the reason people now change opinion about him. Don't try to extract more from my words than I put there, because that's exactly the type of assumptions you're trying to tell me I make.