The key is the phrase "for all intents and purposes", what he is trying to say is that we have as little idea behind what those early humans were like as we do aliens from another planet. He's not saying that aliens created the art.
This is what happens when you read the Daily Fail. Wrong conclusions in the article and quotes taken out of context. The article tries to make it an ancient aliens connection. Not the book or scientist.
This is what happens when you read the Daily Fail. Wrong conclusions in the article and quotes taken out of context. The article tries to make it an ancient aliens connection. Not the book or scientist.