I didn't get to listen to the whole thing... after 18 minutes it cut out on me and I couldn't get it back even though it was still 11:42 PM PST. Oh well. That said...
I had a harder time listening to Erwan due to his accent, but the general subject material of MovNat appears quite sound. The problem I had with the interview format is that it came off more as a MovNat radio infomercial than it did Erwan discussing why training primarily natural, efficient movements are better for humanity than calisthenics, barbell training, Nautilus style machines, kettlebell training, gymnastics or any other mode of intense physical activity. I was able to derive why that might be the case through deductive reasoning and my personal interest and experience with physical fitness... but that has less to do with the presentation than my own knowledge.
Most of the other Summit interviews seem to focus more or less on a specific topic or two related to Ancestral health with only a few minutes to plug any particular website or product the presenter advocates. I know Sean and Erwan didn't intend it this way, but the line of questioning and the answers just seemed too 'MovNat this, MovNat that' and not enough of the theory, how and why, leading up to a 'by the way, now Erwan's going to plug MovNat.'