I can’t speak to the personal motives. I don’t know the people involved. I do feel confident in saying they have not proven anything to me, and I do feel it is likely that the money they made was probably not nothing. You have to put it in perspective - in the world of photojournalism what qualifies as “money” is often far less than it would for most people. It may also be that they made the film for the right reasons and simply are just wrong. For my own part, I just find it to be unconvincing and Yunghi’s argument worth noting.
Speaking generally, context matters as well. This film was made at a time when debunking all sorts of historical claims became a trend, and yes, a business of sorts. Some of those claims were right, some, I think, probably overstepped, or revised in ways that were too aggressive - or overcorrected to a degree that matched the bias of the original story. I consider this film certainly part of a zealous political moment - one that yielded no shortage of poor takes. Just my thoughts.