They didn’t work with Netflix on the content and I’m pretty certain they didn’t get any $ , but Netflix did talk to them before it was filmed and let them see it before it airs. They also offered to provide counseling for the family if they wanted it. I don’t think the Rzuceks had input or veto power on the finished product, but I understand after seeing it they felt of all the documentaries/docudramas that have been made this one is the most fair/accurate.
I haven’t seen the show yet, but give Netflix producers credit for how they handled it w/family (and some non-family represented in the movie). While it didn’t impact their content, the empathy and courtesy they’ve extended to the survivors was impressive and appreciated. And unfortunately not something other production companies have bothered to do.
BTW, According to the Netflix contact, the written preview wasn’t even created by Netflix or anyone associated with the production. Rather an unaffiliated third party who wrote it as click bait.