No, he doesn't state that at all. This is what Milo says, verbatim: "He is a person that some may call a researcher. I am one of those people. More predominantly than that, Graham Hancock is a writer."
> The root question should be “How did ancient civilians create these structures using the technology we believe they had at the time”.
That's an interesting question, but it's essentially an endless one: we will never, ever know how ancient civilizations created everything they created, because their secrets have been lost to time. Human history is so deep and the evidence so porous that we simply will never run out of questions to ask about how they did what they did. Furthermore, even when we come up with ways they might have created things, we may never, ever know whether that's really what they did, because the evidence is not there anymore. There are medieval and later items which we don't really know how were created, but we do know, for sure, that they didn't have power tools.
For instance, what was Greek fire, exactly? There are lots of good ideas, Wikipedia suggests "it may have been made by combining pine resin, naphtha, quicklime, calcium phosphide, sulfur, or niter." Will we ever know which? Maybe, but probably not.