Yes the invite was always there, Rock publicly turned them down because he was on his high horse. He caved because of how the Black Adam stuff turned out. Not only did it bomb, but they also started a smear campaign against him. This cameo/post credit wasnt filmed when they were beefing.
I wouldnt be surprised if he is up for doing Hobbes and Shaw 2 now as well. Writer/producer made it seem like they were really wanting to do it, but it was up to The Rock if it happened.
Them advertising it with the rock in the movie when it's just a cameo is due to the tix tracking.
WHERE DID THEY ADVERTISE IT?



fukk did I tell y'all.
WE GOING OUT WITH