I don't understand why they're being so dramatic about this. Wikipedia says it was carved with stone picks, and they've been found in the site, so claiming it was built without tools is absolute bullshit. I wonder what other facts they twisted to draw an audience.
We don't know enough about the site to have any explanation for how it was created. That doesn't mean it's beyond explanation, it means we need more time to excavate it. There's no reason to jump to any conclusions before then.