That's simultaneously true, and misleading to the point of being wrong. The earliest parts of the layers date that far back, yes. The features of Gobekli Tepe that people who aren't archaeologists actually care about like the obelisks date much later around the second phase of the neolithic (PPNB).

Also note that Gobekli Tepe is neither the oldest site we know of nor unique in having monumental architecture. Even within the Tepler culture, Karahan Tepe dates earlier and I'm sure you heard of the older site of Jericho.