You have to look at in in a wider context. He's been saying 'I'd understand it if he wanted to move to to a big club, but not City' - it's just another way of suggesting we're small, and making it look like KdB's the one making poor decisions. It's all about him 'fighting' to keep KdB, but at the same time, painting the picture that he can't understand why KdB would be making such a foolish decision to join little City. It's just posturing / hot air.
It's probably most of what our fans would say if a player wanted to move to PSG. We'd say 'could understand it if they wanted Bayern / Real / Barca - but PSG???'.