You are right but its different case now.
1- Messi and his legal team believe he is free and can leave for nothing.
2- Barcelona & La Liga believe the release clause of 700m is still valid
If we have to negotiate with Barca, it means Bartomeu is right and Messi can't leave without his permission.
So why is there a video of the Barcelona chairmen saying on video that he can go for nowt?