My personal theory is that Fomenko had figured out the errors in his books pretty early, yet, they were very popular and he had established a very lucrative car

My personal theory is that Fomenko had figured out the errors in his books pretty early, yet, they were very popular and he had established a very lucrative career for himself in the difficult 1990s, so he just continued to publish more books rehashing the same thing over and over and over again, despite knowing the theory to be false. In Russian bookstores of the period there were very long bookshelves filled with his books.