There's a bit more than that. The three pyramids at Giza are among the first being built. We know of several (10-15?) later pyramids which are all smaller and/or collapsed, which fit the narrative of "aliens came, help us build the pyramids, left, and we were never able to build something like that on our own".
And, if thre's one thing we fail to successfully teach, it is that, "fits the narrative," is not, "evidence."