>A thousand year wait??
Ya, here is a graph showing the general trend in heavy weight transport in ancient Egypt over their history (after Arnold 1991, Table 3.1).
Is it now being asserted that the Great Pyramid was built during the New Kingdom? If not the case..... it took 1000 years for this claimed advanced technology to mature to the not so level of achievement compared to today. These aliens really don't look all that advanced considering that this was made back in the early 1800s:
image source: [www.ruskerealie.zcu.cz]
Arnold, D. (1991) Building in Egypt: pharaonic stone masonry. Oxford University Press, New York, 316 p.
Archae Solenhofen (firstname.lastname@example.org)