I went back and relistened to get the verbage of what he says. This is what he is saying that the USFS lady said "If you're not going to have any direct monetization from your film, then you're not considered commercial and don't need a permit." Brian then states, "My content isn't sold, in a theater, sold on dvds, linked back to my website where I sell products, sold on amazon, linked to affiliate partners, and is not being funded directly by sponsors.
I think the only distinction between a fisherman and a guide would be the vetting/safety of clients. Maybe a guide uses the resource more than a single fisherman....I don't have a clue to be honest. Maybe it's also a way to regulate how many people are using the resource as a business.