The technology used to build Göbekli Tepe is entirely consistent with what was available to PPN communities in the region: ground stone tools, rope, organized human labor, and the specific skills that careful, sustained practice in stone-working produces.

There is no evidence of metals, advanced machinery, or any other technology that would require a more advanced civilization.

The builders were impressive in their organization, their skill, and their vision — but they were people living in the late Stone Age, as the full body of evidence makes clear.

The claim that the site was built with extraterrestrial assistance or involvement is not supported by any evidence.

It does not require refutation at length: the same archaeological record that makes the site remarkable also makes its human, terrestrial construction clear.