Ariputra, you answered your own question.
It's some kind of Indian epic. It's like the Tale of Bygone Times, where many heroic deeds of Prince Oleg the Seer are described, where it says that he was a sorcerer, that he went to Constantinople in 907, but official Byzantine sources don't mention it at all; he went there in 911.
An epic, a tale, and that's your argument? I find it amusing.
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