Time scale. We plan, design, build within a decade at worst for most things.
I think he's more referring to the precision for which many of the very large pieces of most designs were cut and fit moreso than simply scale.
Ex: Sacsayhuaman, Peru
"While the much more famous Machu Picchu is renowned for its views, Sacsayhuaman is a marvel of engineering, confounding Spanish conquerors who were so amazed by the construction, they thought it must be the work of demons.
The largest of the boulders that make up the three dry stone walls of Sacsayhuaman – all carried from a quarry located over three kilometers away – weighs an estimated 120 tons. But the seemingly superhuman feat of moving these boulders is not the most incredible aspect of the ruins: even thousands of years later, the stones of the walls fit together with such precision, you can’t fit a piece of paper between them.
This precision, along with the various stone shapes that fit together like a puzzle, is likely the reason that the structure has survived earthquakes that have devastated the area.