We aren't going to give him 12m, take it easy.
Also, I assume he's not going to consider 12m to be the lowest number he can go to and if not accepted, he starts looking elsewhere. Don't believe that's gonna happen.
Agent is just doing his job. He even said he hasn't talked to anyone else because the will of the player is to stay at Inter. So of course the agent need to try to play hardball here, throwing these big numbers up in the air because he doesn't have shit tons of leverage, because his client has been very clear to everyone he wants to stay at Inter.
The leverage comes from Lautaro's performance as a captain leading the team to a historical 2nd star, capocannoniere award and MVP of the league award (and of course the continued growth as a leader and as a player). That's the only thing the agent has "against" the club in the negotiations. When the player's will is set, agent needs to play with the cards he's dealt with. Can't invent cards out of nothing (look for offers from other clubs).
So, everybody, giga mega ultra chill. Just like I said with Zhang-Oaktree, just chill!