By himself, most likely. Most of these turn out to be attention seeking hoaxes.
Several years ago a muslim woman “found” a note on her car.
In scrawled and misspelled english it said something like “Muslum go hoMe - AMerica no waNt you”
Below there was arabic writing. It had a simliar message I guess, but it was perfect in it’s flowing and complex nature.
This guy’s lawn? Who knows. Some places still have the idiots that would write this crap on someone’s lawn. Although I guess I’d rather have this than the “knock-out game”.