African immigrants?

I have often contemplated the relatively homogeneous ethnic makeup of Argentina. Having lived most of my life in countries or cities with diverse populations one can often assume that everywhere in the world is like that. From my few trips to Argentina I can recall that Buenos Aires is not.

Today I spotted this article about African immigration to BA. It suggests that as Europe has effectively closed it's doors to African immigration more Africans are making their way to Argentina where getting in and staying is easy. It's a fairly light and one sided article and I would love to understand more.