Watch the video in the original post. It shows that there are marks on the stone of many ancient structures that are identical to those made by modern high speed drills and saws.
In addition, many ancient structures are made of the hardest varieties of stone, such as andesite, granite, dolorite, etc. Today we use diamond tipped tools at high speeds and pressures to cut such stone.
Look at the sheer scale of the works in Egypt alone, and try to imagine the investment of time and human labor required to quarry, cut, finish, haul, and set in place the tens of millions of individual blocks that sit there today, using copper chisels and stone hammers.
If that doesn't boggle your mind, consider also that those monuments were constructed with a degree of precision that we can scarcely match today. For example, the Great Pyramid is laid out to within three one hundredths of a degree of true north, and it's a 13 acre building!
We ourselves didn't possess the tools to measure that degree of accuracy until 1964, when the laser transit was invented. How did ancient people who didn't even possess the most primitive transit devices orient a structure of that side to such scientific accuracy?
The answer, of course, is that those ancient people had access to technology that has been lost to time. Its my personal belief that the greatest monuments in Egypt are far older than the Egyptians themselves.
I believe that the earliest Egyptians were brought out of the stone age by an older, much advanced race of people who taught them the basics of social organization, and who shared technology with them that allowed the Egyptians to build such massive and complex structures.
I also believe that those ancient Egyptians immortalized the principal figures of that parent race by weaving them into their religion as gods. It's my theory that the parent race moved on, and that the technology they left behind became lost, due to those tools being regarded as the sacred magic of the 'gods' by powerful rulers and jealously superstitious priests.
Modern people are so invested in the accepted paradigm of ancient history, that any physical evidence of such advanced tools will never be revealed, if found. In fact, a contingent of western scientists showed the Director of Antiquities, Zahi Hawass, the tool marks we're discussing, he revoked their permissions to investigate Egypt's monuments.
How could all of that equipment AND the know-how be lost? If they had high tech machines, they would require documentation to build it and maintain it. There would be schools and libraries full of that documentation. There would be mills to make make the materials from ore, and there would be shops in which the machines were built. Industry requires massive machinery that would, in fact, outlast those stupid pyramids.