Asking the question that I asked was a little unfair, because I've listened to everything on FDR (Seriously, but I started in 2006, so I didn't have to catch up) and have worked with Stef on several videos and have had fairly long interactions with him.
I know with quite a degree of certainty (I'd say over 99.44%) that the dude isn't promoting the 9/11 truth stuff. I would like to see a link to what led Mike to think that, though, because I know he's a sharp cat and I'm sure there's some sort of misunderstanding.
For the record, my interactions with Stef have been largely positive. There were a couple bumps in regards to creative stuff (Disagreements about how quickly I edit and how many cuts I use) that were hammered out fairly easily the second I mentioned them. Also, getting hold of the dude when you're trying to collaborate on something is difficult. He can send you and email, you can respond within five minutes, and two days later you'd hear back from him.
Not major shit. I'm sure most people who work with me have similar complaints.
Stef's just this dude. He's got some great ideas in regards for the liberty thing and I'd say that his ideas are a good influence on the community of ration freedom lovers. I give him credit for that and I'd call what he's doing a sort of post objectivist revision on Rand's work that has significant value. He's certainly plugged up some of her more egregious holes in ethics as far as I'm concerned.
Personally, knowing of FDR has improved my life and made debate with statists far simpler, which has freed me of months, if not years of my life.
Also, I am not a member of a cult.