Given it's nearly 2 hours I will have to find some proper time to listen. I suspect though that from previous sights of Harris and Benatar on the issue I will probably disagree as well. There is a question about population size just don't think that anti natalism is usually subtle enough to deal with it.
ETA: David, given that the link is to 2 hrs of discussion and given that might be a bit of a commitment for most on here, Is it possible to give a summary as you see it of what you disagree with?
Also if you are reading. Keith Maitland, I think this is right up your axis of interest?