Sure, but this isn't about the filmmaker's intentions (which are unknowable to us, really) but about what the finished product has to say. This film has a very constructed narrative, which isn't to say it's without worth or that it's untrustworthy, but that it only tells one particular story. It's not unfair to say it quite easily infers that narrative is more complete and representative than it perhaps is (just look to the title!).
Whether or not you believe media is responsible for the impact it might have on people, or that people are responsible for the impact media has on them is another matter. But it's worth remembering that nobody is above the implicit suggestions and messages of the media that they consume. It projects a distinct narrative about indie game culture, that without prior experience, you might not know was incomplete. Someone might watch that, quit their job and pursue the romanticised indie struggle only to be met with disaster. Their own fault? Maybe. But it remains true that the overall picture of the industry painted by the movie had a big success bias at the time, and (through debateably little fault of its own), an enormous one now given how the industry has developed since. It's definitely worth criticising on those grounds.