Good video. Some of those stone cuttings are just baffling. Totally impossible with any of the tools we use today.
Maybe they used giant 3d printer-like vaporiser.
Something that was able to melt the stone and do a corners deep inside the stone. The idea is a machine with 4 weak lasers that when crossed, form a hotspot which vaporises the stone at a specific point. That way it would be possible to get those strange cuttings out of the rock.
Also very strange that some of the rocks are so carved up with shapes that they look as if they came from a much larger structure that exploded over a huge area. They are so strange, they almost look like parts of a machine or something.
Just like some of the larger structures, that look more like part of a machine then a building for living or worship.
Very interesting once you think about what must have happened here in the past, there is no easy answer.