I think that argument is a little irrelevant these days tbh. He's at a bigger club with bigger expectations and loads more media attention, bigger resources and lots of star names. Not a club that couldn't afford to play its players for about six months where he had to make do with what he had at one point.
Plus, he's likely leaving in a year. Why would he give a fuck about promoting a kid? Not really buying it that he'll have a long term view here, which he would have had at Malaga to an extent as his rep was being built again post Real.
They still had to produce a heck of a lot at their respected clubs. Isco had a highly promising season at Malaga where he helped them to the quarter finals of the Champions League.