He claims he sent samples of his cast limestone to geologists and they couldnt tell the difference. Overall I think his theory makes much more sense. It just would have been easier to pour each block in place rather than lug huge stones around.
>If it is not convincing enough: Recent scientific studies using very powerful and modern equipment found the ultimate evidence that the pyramids stones are synthetic. Believing in the artificial stone theory, or countering it, is simply no longer relevant. It has become a fact, a truth.
https://www.geopolymer.org/faq/faq-for-artificial-stone-supp...
In my experience, people who use repetition like this are not to be taken very seriously. It's a blunt persuasion tactic employed by the likes of used car salesmen and cult leaders.
You can find videos of them on youtube actually making these stone blocks though. The method works. Based on how long it took a small team to make a couple on their first attempt, it could be a hundred or even thousand times more efficient than carving them out and transporting them.
So if I were going to build a large limestone pyramid that's how I would do it.