Yes, he does talk about that in the second video. He said his team almost stopped completely after they uncovered that fact, because they didn’t believe it either.
I’d have to check the video, I understood the graph to be only showing only adult males of a certain age in that time period. So the actual population would be many time larger.
Right, as I said, it would only track men of child-bearing age, if I’m understanding correctly.
Like I explained earlier, you can’t disprove evolution by believing in it.