It's a very interesting video. The other link was also agreeing with the contention of poured concrete, not giant carved blocks of stone.
One or two things are questionable, the water drop measurement, as I don't believe a drop can be consistent. He also doesn't discuss what the molds are made of to withstand liquid lava during pouring and cooling off.
All the animations are of course speculations and should be treated as such. But it's a pretty strong argument with all the chemistry and such.
But being it's a finished video, I do not know if much fact checking has been done on his examples and sources by other independent 3rd parties.
And I made mention of this quite some time ago with links that showed the odd shaped window and doorway across the world in all sorts of building by allegedly different people. The shape is an opening where the bottom is a few inches wider than the top. It shows up universally through out the world. To me that just can't be happenstance.