Puma Punku H-blocks: I'm sorry but the precision is wrong for the date

Bolivia, 3850m up on the altiplano, part of the Tiwanaku complex. Conventional dating puts the main build around 536–600 AD-ish. Fine. What nobody satisfyingly explains is the andesite work. Those famous H-blocks have interior right angles, drill lines, and flat planes that look machined. Not 'prett……