That makes 4 or 5 "plausible" interpretations "fitting" the legends to locations in the landscape that I've heard of or read, I'm sure I may have missed a few more. All apparently well "researched", mostly by people who describe themselves as archeaologists or historians. Interestingly, none of them seem to quite agree on the locations.
I'm a little concerned by the prominently displayed contents of the library in this video, mostly conspiracy theories by the look of it. Doesn't mean they are wrong necesarily but it does cast some doubt on thier credentials, most serious archeaologists or historians would hide books like that behind more reliable sources, if the had them at all. Sadly, such conspiracy books do tend to run on circular logic.
That is part of the power of stories of course, we can each choose to believe them or not. I confess, I'm not seeing much in this story to convince me, but my standards of evidence are quite stringent I guess.