I'm no 9/11 expert but I think I can comfortably say you won't be missing much if you don't watch it. Having said that, they do seem to be reviving the story and maybe setting the scene for questioning the official narrative and towards the end it seems like the brother (Matt Campbell) of one of the victims is working to enter findings (for lack of the technical terminology) into official proceedings to have them consider the idea that there were explosives involved.