His agent is mentioned is due to the fact , that if he signs - will ask for a move within 3-4 years. If he performs well and as expected - he would deserve a price rise as well.
Agent fees are Standard , and everyone pays it including city .
This exactly. From a player's perspective I don't think we have a problem with that. Khladoon mentioned in his interview that we're willing to reward players with extensions and pay raises even a year after signing if they've earned it - as we've already done with the likes of Bernardo, Ederson, etc. But Raiola would love for him to go somewhere other than Barca because then he can use them again in 3-4 years either for another move or a big pay raise at the club that gets him now.
You can see it coming a mile away, same with Mbappe going to PSG at 19 when he supposedly dreams of playing for Madrid. These players know they can make multiple moves because they're rated higher than 99.9% of 19 year old talents before them.