I watched it. I didn't hear anything about open borders in there. He talked a lot about accepting refugees, which has been a standard part of international law for decades now, but that is very much not the same thing.

The part about how Europe colonized many places was just a description of how Europe itself was fairly insulated from the rest of the world for a long time, which can make it hard to suddenly start accepting a lot of people from elsewhere because it's a big change. There was nothing at all about this meaning Europe should open its borders.