Hi everyone!
New Basenji owner here from Melbourne, Australia.
I know this topic is a couple of months old but I thought I'd just add my experience for anyone else needing help with puppy biting.
My wife and I had been having mouthing/biting trouble with our (now) 12-week old pup for the last week.
The behavior has improved almost instantly by following the advice in this video.
She's still pretty mouthy but it doesn't escalate the way it did before when we'd try and stop her from doing it/yelping/saying '"NO". I think everything we were doing was just turning it into the funnest game ever for her!