Nye should not have done this.
Debating kooks only lends them credibility and tends to further kookify them.
Nye has a BS in mechanical engineering from Cornell, and he hosted a kid's show about mixing baking soda with vinegar and growing salt crystals --- thats all. He's an oompah-loompah of science masquerading as someone who actually knows something about anthropology, ecology, astronomy, etc.
On paper, he no more qualified to discuss this stuff than Ken Ham, you, or me.
IMHO, Ham lends Nye more credibility by this debate than Nye lends Ham.