The problem is that "mythological" often implies falsity, probably because most of us
encountered myths labelled as such in reference to Greek and Roman mythology.
Since nobody believes in their truth anymore (presumably), we learned that to be a myth
was to be false (e.g., the Loch Ness monster is a myth).
Running to the dictionary for definitions can be a copout, but:
myth 1. a. A traditional, typically ancient story dealing with supernatural beings,
ancestors, or heroes that serves as a fundamental type in the world view of a people, as
by explaining aspects of the natural world or delineating the psychology, customs, or
ideals of society: the myth of Eros and Psyche; a creation myth.
So the first definition doesn't mean that myths are false. I presume that Dan meant
"myth" in the sense defined above, and not as in "false".