It couldn't have been that advanced. Anything too advanced would have proved so immensely useful beyond merely building pyramids that it wouldn't have been los

It couldn't have been that advanced. Anything too advanced would have proved so immensely useful beyond merely building pyramids that it wouldn't have been lost. The most advanced technology I could believe they had is: a) primitive pulleys (as described in TFA), b) rollers (but not wheels; those came later), c) some sort of limestone cement they could use to pour blocks in situ (in molds) rather than pull/push them up ramps. Anything much more advanced than that is way too hard to believe. The fact that wheels once invented were not lost is highly suggestive that any generally-useful advanced technology would not have been lost. Some construction techniques that were not needed for anything other than pyramid building could have been lost, yes, and that might include primitive pulleys, but not advanced pulleys as those would be useful in loading and unloading boats, and building all sorts of things besides pyramids. Anything like alien tech is out because if it happened, they didn't leave enough evidence to believe it, so we might as well not. Really, Occam's Razor applies here.