Because from what I understood it's a gentlemen agreement between Perez and Ronaldo that is only valid for teams outside PSG, MU and the likes, direct rivals (maybe financially speaking). So there was no signed paper that's why Perez could still ask for something more than the 100 m, and not be a gentleman. I think he's only problem is that the way Ronaldo reacted, I guess he wants him to come out publicly and announce his attention so he escapes their fans blame.