Origin of the myth of bloodhounds?

The myth that bloodhounds have a billion olfactory receptors traces back to an unfounded claim. Noam Sobel, speaking on the Huberman Lab, detailed how this number was propagated through literature without solid grounding. It originated from an Australian textbook, which attributed the claim to a lecture by geneticist Duran Lancet. However, when contacted, Lancet had no recollection of mentioning such a figure, and humorously, he didn't even know what a bloodhound was 1.