Griezmann was delivering sensational kind of football in his first spell at Atletico Madrid but has failed to deliver kind of football in his second spell.
I don't know which Griezmann you watched but the Antoine Griezmann of Atletico was exceptional last season.
Griezmann was even in the La Liga team of the season and was a candidate for the player of the season.
If he feels Saudi is the best decision for him then fine. Atletico need money and they might be happy to sell, but I doubt they would want to lose Griezmann.
Griezmann still wants to stay at Atletico and Atletico still want to keep Griezmann but they might sell him to balance the books if a good offer arrives.