No, I don't think that is what he is getting at at all.
He is saying that overall, the whole world is more educated, wealthier, and more urban, than they ever have been. Including in the developing areas of the world.
Many people had shitty lives in the past and might have wanted to get away from them. but the reality of those lives did not include migrating. They didn't have the knowledge of where to go, or the means to try.
Now, many people can see where they could go for better opportunities, and they can imagine making a life there. They have some skills and they can find some funds. Or, if not personally, their extended family can put together the money to try and send one person.
That middle group, worldwide, is huge now compared to what it used to be, and the ability to get information is so expanded.