Yes, and let's keep in mind what it is Dylan Avery is making progress towards:
Acknowledging that his entire adult life was a fraud.
You have to admit, Avery is pretty deeply vested in the conspiracy. It made him important, popular, and wealthy at a young age. For him to admit it's all wrong is to destroy the only thing he ever built in life, to turn his back on his friends (who are by all accounts still true believers in the conspiracy), and to undermine his dream project.
That's gotta be tough. Read any "former truther" threads here, like
this one, and you can get a sense of how tough it is for people to admit they were wrong. And that's just for a rank-and-file Truther, not someone whose every good thing in life was based on it.
Loose Change is to 9-11 what Milli Vanilli was to pop music. Each was a fatally flawed production whose popularity got out of control. When the fraud was inevitably exposed, its creators couldn't get any legitimate work. After a couple attempts to set things right that nobody cared about (Rob & Fab, the various LC special editions), each silently dropped out of sight... except when they're dragged out for some mocking retrospective interview.
And that's got to be a special slice of hell. To be asked for your side of the story, when the world long ago made up its mind that you're wrong. After that Slate interview, I bet he went home and drank heavily. You would too. Think of your stupidest moment, and imagine you had to be interviewed by Slate about it every five years, with the resulting material finding its way into Google. "Hey, aren't you that guy?" "Yeah, I'm that guy." And some people can't deal with that. Like Rob Pilatus, who self-destructed after Milli Vanilli was exposed.
Yes, Dylan Avery said some of the most horrific things ever recorded about 9-11, perpetrated its most dishonest claims, and profited greatly from it all. But unlike the others in his crew, or any other major leaders of the Truth movement, he's showing signs of contrition, or at least re-evaluation of it all. So, as Kevin_Lowe said, let's encourage his progress.