The problem is that it doesn't prove much of what was there. There are definitely things that don't add up, including many grade changes, lack of news of constructions that should have made it in many newspapers, person accounts of, "old world," buildings before their records start, and more. But, the Tartaria great culture/empire stuff is just too weak. That history has been manipulated, I think there is sufficient evidence for. But, they take too many logical leaps to get to the conclusions.

Now, I'm given to believeling in giants, due to how authorities and museums have behaved, consistently. If there were nothing to it, they'd have large swaths of debunkings, instead of taking everything, and clamming up, in some cases even lying about it in the face of clear evidence (smetimes even receipts). This repeats, as a MO, across space and time. As well, many Native American tribal history details, some of which include said giants, from their oral histories, keep getting shown more correct, over time, as new evidence busts mainstream anthropology's narratives (though we still don't know WTF happened to the miund culture peoples, AFAIK). What would admissions of their veracity lead to, that's worth the centuries of coverup?

It's also clear that, while mainstream history downplays it, zeppelins and blimps were a much bigger deal, and used much more, than we are led to believe. Again, why? That doesn't seem worth the effort to suppress, on its own.

For architecture changing for the worse, I'm not 100% sold on the idea, but I can consider that Bolshevists and their political kin may well be responsible. Maybe not, though.

Energy is more interesting, and we have modern evidence of actually greener energy being suppressed.

Thing is a lot of it could end being very simple, though it may be difficult to reverse engineer it. Like Roanoke, where just a few years ago, it was finally proven that they went, "this place sucks, let's move," and lived happily ever after.