James Mangold pointed out at the time that some of the information, like the fact that the Indiana Jones 5 script was written by Jonathan Kasdan, was just plain wrong.
Kasdan had taken a shot at the script, as many others did before and after him, but the final script was written from scratch by James Mangold with Jez and John-Henry Butterworth.
While other “points,” like suggesting that Harrison Ford’s age was somehow a reason the movie would be bad, was purely ageist.
On top of all that, nobody has actually seen the movie that’s being made, it isn’t even done filming yet, so nobody has any idea whether it will be any good or not.