Isn't he a married man now? Wouldn't that make him the "paramour"? If he's the paramour, then would she be the "adulteress"? That would indeed feel sarcastic and insulting to Xiaodi.
"Alright, actually they are a pair of a talented man and beautiful woman, just recently in a romantic moonlit setting." A talented man and beautiful woman in a moonlit setting, do they really only enjoy the flowers and the moon? They might also have an affair, right? But saying it out loud gives a different artistic conception, and that's the effect of rhetoric.
