See above. Saab released a video falsely claiming the gripen turned 9g. It was actually a 4g turn.
Do the customers of the gripen have the right to sue the company for false advertising?
See above. Saab released a video falsely claiming the gripen turned 9g. It was actually a 4g turn.
Do the customers of the gripen have the right to sue the company for false advertising?
No.
There is no reason for anyone to believe that a country's Air Force would purchase a military jet fighter in reliance upon a comment made by the company in a promotional video intended for the general public. And, even if it did, generally "buyer beware" applies to international purchases of military equipment. It would not be reasonable for the UAE to rely on the video in question as authoritative. And, I very much doubt that the specifications of the jet fighter provided by the seller to the UAE military said the same thing.