What if I were to tell you - the dating/age of those structures is off by an order of magnitude or more, and the civilization that we assume may have built them only used (and possibly defaced) them.

The earlier civilizations were more technologically advanced than us, but also likely didn't originate here. We likely didn't originate here either, although we were genetically adapted to this planet's environment.

We are just getting a glimpse of some ruins of civilizations that have been largely erased from this planet, whether by time, catastrophe, or design.

And the temporal bits? By making material change to the mass or composition of the planet, you will make significant changes to its orbit, which changes the length of its year. Also its rotation would likely be different, meaning its length of day changes. When that solar cycle changes, the way things oxidize and age changes.

Our dating systems assume rates of decay based on current conditions, and I have no confidence those conditions remained the same, even 10k years ago.

It is just more hubris, assuming we are the only intelligent species not only in space, but in time. We're making the same mistakes of heliocentrism when it comes to the mechanics of time, and I haven't even opened up the box of quantum mechanics yet.

Also, reality (fabric of space/time) isn't real. It is simply how WE have evolved to experience reality. This isn't really matrix shit, much simpler and more fundamental than that.