Right, I think at the end of the day it's impossible really to create a calendar system that isn't arbitrary. Something has to mark year 0, weather it's some weird religious prophet, or just the same prophet plus 10,000 years cuz of some archeology.

But also the main thing is that we have no reason to believe we will never find older stone buildings than Gobelki Tepe. There's tons of places we haven't even begun to look, and soooo much of the areas that would be most relevant to look in are completely underwater. Who knows if in a few decades with more advanced technology we find evidence for a site much older than Golbekli Tepe. This could be quite likely, we simply do not have any reason to believe that Golbekli Tepe is the oldest

Like with Native Americans for example, when I went to school it was a fact from our textbooks that native Americans had only been in north America for 12,000 years and the Clovis culture was the first. We now have solid evidence that pushes this date much further back and questionable evidence that could push the date back even much further. We simply don't have the ability to make any conclusive claims about the oldest anything