The jokes in a D&D campaign—even one run by the lead rules designer—have no bearing on the rules

Does the monks slow fall ability use their movement?

Does Divine Smite works with Unarmed Attacks and/or Natural Weapons?

On a related note, myself and a large group online have been trying to figure out whether Divine Smite works with Unarmed Attacks and/or Natural Weapons. It seems like you’ve both said it does and does not work. Would you be willing to help us out by clarifying?

Are the 9 hells and layers of the abyss round planets?

Is spellcasting not an ability?