The way the stones are cut and even the technology to be able to do that didn't exist yet. Plus, they're are all over the world not just Egypt and are synchronized in a way to match with certain stars. There's far more to pyramids.
I just want to point out that we are taught people in the ancient world were savages when they werent.
This isnt me saying Egyptians built the Pyramids.
Its just me saying we give ancient civilizations way less credit than they deserve.
Ancient Sumerians built complex cities, had their own language, they wrote down a law of codes, wrote a bunch of literature, had doctors, dentists, brewed beer, had trade ledgers marking down everything bought and sold, had irrigation systems where they rerouted rivers.
They were the first to break numbers down in 60s (think minutes and seconds), they are the reasons why circles are 360 degrees.
Theres proof they played sports and board games.
Theres proof they had different hair styles.
They might have not built the Pyramids but they did build complex cities with city planning and Ziggurats.
Egypt had all that but they also had currency. They found bathrooms, baths, toilet seats in Egypt.
Their city planning was way more advanced than Sumer.
Even if they didnt build the Pyramids, these ancient cultures were way smarter and more advanced than we have been taught they were.