So that's great evidence for racism being in archeology in general but I still don't see the connection between that and people crediting aliens for things we don't completely understand.

Edit: There are definitely good examples in the article but they also use your argument about things that were built way more recently compared to things that were built before written language. Egyptians definitely built the pyramids, they're in Egypt so by definition that's what happened. But I really don't believe people getting excited over the mystery around how it happened and then pointing to aliens as a possible answer is rooted in racism at all. That being said, there seems be all sorts of nefarious reasons to put that alien explanation on things that are much easier explained without aliens.