He’s right. And as you know from the SDTS he’s actually showing two different chokes here. The first is a Japanese Strangle – Hadaka Jime (which can EASILY be a respiratory choke). The second is what we call the Rear Naked Strangle (Ushiro Jime).
I don’t know why he shows the chain grip or “finger grip) with that one since the wrestler’s grip or heel of hand grip is a lot stronger. Oh well, it’s a 3 minute video and you can’t cover everything.