Not that it sheds any light on things, but “neat” is a particularly European (mostly Brittish Isles) term that has been co-opted by Americans to make them sound more sophisticated.
My father, who, if he were alive would be 107 emigrated from Scotland, and was the only one of his group of buddies to use the term. All the other men in his age group said “straight.”
I think The Usurper’s use of the word is just faux-culture.
I agree with Jack Cashill that they were not the usurper's words at all.