This isnt really Pep's call the club dont want to pay him the salary he desire and he wants to leave really nothing to it. Very similar to the Ballack situation.
Its good that Alaba has competition for his place, he had some woeful games last season. Especially his crosses were quiet atrocious at times, hope Bernat lights a fire in his belly.
I think he is saying the grass isnt always greener type of thing. Hummels knows he is still young at 25 especially for a CB. He can enjoy himself in an environment he is most comfortable with and not have to force a move yet.
I doubt he said that and even if he did we should all know by now players are pathological liars. The issue is BvB are stubborn and hell and wont even consider negotiating a "reasonable" fee.