This says it all mate. History is always open to debate but it doesn't mean ideas can be plucked out of thin air, or defy the laws of physics by harvesting energy from a church spire. Believe it or not 'his story' isn't just one set of ideas from one viewpoint but is an assessment made by all kinds of people based on real source material.
Tartaria is simply what Russia and the East was called on old Western maps - that's all this theory is based on, just semantics. Then it's been lumped with all sorts of other wild ideas including that the Blitz was an attempt to destroy evidence of this so-called 'lost empire' and that the UK's coastline was a defensive wall built by giants. People can be made to believe anything if it's delivered with self-belief and frankly this forum is for recording the history of places rather than misleading with false narratives.
If anyone has no clue what this is all about I suggest reading this:
Bloomberg - Inside the βTartarian Empire,β the QAnon of Architecture