I'll note that there are many religions in the world, and at most one of them can be correct. Some of these faiths require you to believe things which are much less likely than Maurice Jarre saying what Fitzgerald had him saying.
My point is that it's not very impressive to make lots of people believe things that aren't true.
I agree with you in the general case, but when some of those people are journalists who work for respected newspapers, then it becomes...maybe not impressive, exactly, but certainly significant.
Journalists have a responsibility to make sure they're printing the truth. It's really distressing to know that there are some out there who are so lazy. This particular example isn't that big of a deal, but it's easy to imagine something similar happening with something more important.
My point is that it's not very impressive to make lots of people believe things that aren't true.