Just to keep the record straight I'm a hoarder but when the old back or hip keeps me from splitting and I need wood I'll occasionally purchase a cord to get me through.
I think I know what he is trying to say although I don’t know if I would use the term “too dry” myself. Probably more like extremely dry—as in wood you might find that has been stored in a barn up off the ground for 10+ years—an extremely rare occurrence for most people. In that case I could possibly understand how the wood might combust so quickly (off-gassing) it would need more air than regular wood to keep from “smothering” and thus creating more smoke that contains unburned particles which in turn create creosote. This could be easily remedied by cracking the stove door for an extra 10-15 minutes while the wood is in its initial combustion phase) But I am only theorizing this through in my mind. I have not yet encountered any firewood that is “too dry”.