I don't believe a word Sport says, just calling beautifulgame on his bullshit argument that somehow Neymar helping get a trebble is something out of this world and we'll owe him something if he does.
I don't even mind if he goes to both competitions, trebble or not; pretty sure he'll get yellows and escape to party in Sao Paulo again anyway
It's probably not true and, if it was, it was not phrased appropriately.
But don't see what is so surprising about it. Players gets rewards and bonuses when the team achieves certain objectives, that's normal and is used in contracts as an incentive. In this case however, the "reward" is to let Neymar represent in country as much as he wants and not a monetary one.