I would think it's extremely unusual if he used a more modern tone and vocabulary.
I don’t know that I’d find that unusual, either, honestly. Judging by the bullet memes, he was clearly very “online.”
People are complicated. It’s convenient and very tempting to put everyone into neat boxes, but individuals often don’t fit into those boxes. Not completely.
A sleeper is something else though, sort of the opposite of a ricer. A sleeper Honda Civic would look largely unmodded but be a monster under the hood. A ricer Honda Civic is gonna have a wing and loud, giant exhaust and other very obvious modifications.
Personally I love a heavily modified Japanese car, and in my experience of car culture, “ricer” has largely been reclaimed by the people who drive them.