"Helps to read the article.
Theorists believe the Illyrian people who inhabited the Balkan region before the conquering Slavic tribes overran them about 1,400 years ago had the sophistication to shape a hill into a pyramid."
I did read the article. The fact that the people who could have possibly built something like this left 1,400 years ago only tells me that it would be at least 1,400 years old. I am no expert on the Illyrian's so I don't know how long they occupied this area. I thought the poster may have more info on the subject since he is obviously interested in this subject.
You have a point. BTW, neither am I. I never heard of the Illyrians until this article.