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Gilgamesh literally has the origins of all human knowledge. Anything humans can do today, he has a copy of. Board games, wine, etc. anything at all. This includes the grail. He also has other spaceships you know like a ship of light, legitimate modern airplanes and submarines, etc. Also the concept of a wish giving device should have been prominent in Gilgamesh's time, so voila he has a grail that can grant wishes in theory. The clause isn't about him having things conceived at a later date, it's stating that he doesn't have things that aren't made by human hands like Fae weapons or alien stuff. He also can't have exact replicas of his originals molded by legends such as Gae bolg. He has the gae bolg that was the spear, but not the gae bolg that became famous. Gate of Babylon has all human knowledge stored inside it, and its so huge Gilgamesh admits he doesn't know all of what is in his treasury.The spaceship is a Hindu thing. They were made after his time but had their core idea based upon something older which supposedly was from his time. The grail was an object made to provide a path to the Akasha... which would have been completely unnecessary at Gilgamesh's time before true magic was lost. I'll dig up the junk on it later but I recall there being a clause in Gates of Babylon, stating that he doesn't have stuff that had their ideas conceived at a much later date.
Basically during the very beginning when Gilgamesh was the only king, humans invented everything conceivable within the limits of their mind from board games to explosives to spaceships etc. through magic and not technology. However, they're still the same in that they serve the exact same purpose. Gilgamesh took every single treasure on the earth during this time and stored it in his vault as his own, hence why he has the "origins of all human wealth/knowledge" since he literally jacked everything made in his time which includes anything able to be made in our time but better.