This is the sequel to Ann Delap: Cabal Video Series Parts 1-10 with Summaries - which covers the story in the modern era - it is suggested to read that first, but it's not strictly necessary.
This sequel is indeed a deep dive, starting in ancient Sumer and the Sumerians (of cuneiform script and clay tablets fame).
However it soon skips to 600AD and thence moves quickly on to the 1700s, about which we know a bit more.
This looks like being a 17 part sequel, of which (as of 8 January 2021) 5 are so far available, so you will need to consume over several sessions.
The usual caveats apply - please make up your own mind about how much may be true and how much false - this territory inevitably includes a lot of speculative material.