What Sid said. With buyout clauses players can basically become free agents at any time.
So it doesn't matter (if true) that Barto went ahead and
a) thought it'd be OK to do this the day (or days) before their rematch against Juve (in which they had the upper hand) with a final at the Wanda in sight
b) you talk about this weeks ahead of the all-important game against them in April, probably with none of the squad knowing
c) you start negotiating the day before the clause goes down telling them "yeah we'll pay the 200 on 1st July" and sign pre-contract, but you end up saying "actually nah, it's 120M now isn't it? You still want the 200? Really? Dude... That's a lot.. Ohhhh, okay, can we do this in installments though?"
d) Atleti have gone ahead and paid 120 million for Felix knowing they'll subsidise it from the Griezmann clause. Now they're being told they may not be getting the money like it's been agreed
Pretty good circus I must say though.
All the more funny that this is all about this Fortnite shmuck who none of your current vets like and you're not sacrificing them to commit to him