My problem is that you seem to be of the opinion that everything that Humanity has made will be destroyed. All traces of human civilisation - every single thing we've ever accomplished - will be lost to the depths of time.
I'm asking you how you can say this when we know for a fact that something as delicate as an eggshell, or footprints in wet mud can last for millions of years.
Yes, I am fully aware that the vast majority of eggshells, footprints not to mention bones, teeth, etc from back then have been lost. But the fact that these delicate things survive for millions of years is proof that things that would appear to have no chance can actually survive through deep time. So if the idea presented in the episode is true, that dinosaurs had a culture, then we would see some of that today.
In any case, we see things that could NOT be if the episode's idea was true - namely dinosaur nests. I doubt that a species that is advanced enough to develop spaceflight is going to think that the best place to raise children is from piles of dirt in an open field. And yet we've found plenty of dinosaur nests.