De light was laughing stock for Juventus, basically like Maguire was for us for few years. Record money deal that finished in him scoring own goals every month there, have you even been watching him there?
Also he is not Bayern's best defender, all of Upamecano, Davies and Kimmich are better than him, probably Kim too. I am not sure he is even their first option when everyone is fit. And their defence isn't even spectacular either, Eric Dier plays as a defender there which says a lot, there is a reason they have finished third last season in BL. Bayern don't have financial reasons to sell unless they don't find him waste of space on his wages, because they could finance probably two better players for same wages.