It could be something to do with who receives credit on F9 as a producer.
Clearly, Vin Diesel thought better of his angrier post, though that doesn’t mean the issue, whatever in the world it is, isn’t still a potential issue.
It’s possible there’s some dispute between the studio and the P.G.A. regarding who should be listed as a producer on the film.
The issue might surround Diesel’s own credit or that of somebody else on the production.