Incorrect.
Generally, "midget" refers to a person who is very short, but normally proportioned. "Dwarf" refers to a person with one of several varieties of a specific genetic condition called dwarfism - usually they have very short arms and legs and unusually large heads.
So Dave Henry would only be considered a midget, right?
What about a midget with a bad attitude? Is there a term for that, or can we just call them assholes?