I'd like to know whether there is any solid historical, scientific, and archaeological basis for the hypothesis put forward by the authors of the book "The Path of the Spiritual Sun" and summarized on their website https://www.spiritualsun.com/lost-civilization-sun

Please take a look at the claims on the website and let me know. Briefly, they claim that there was an advanced civilization of sun worshippers from at least the 10th millennium BCE, that this civilization existed in the Americas, Europe, Egypt, India, China, and Pacific islands, and that they built megaliths aligned with solstices and equinoxes such as Stonehenge, Arkaim, Carnac stones, pyramids, etc. This civilization was allegedly Caucasian. They claim that the civilization was founded by survivors of Atlantis after a great flood in the 10th millennium, and that some of these survivors were Odin, Osiris, Thoth, Viracocha, etc. as historical persons. In the book they cite sources such as Graham Hancock, Thor Heyerdahl, Martin Doutre, and Andrew Collins, who are associated with pseudo-archeology.