"That's not a horse, this is a horse."
Interestingly enough, the last picture in the letter is "Trophies and Sycophants" by Zimbabwean artist Misheck Masamvu. The restaurant belongs to a restaurant group with at least three restaurants in it; one of them appears quite normal.
Hypothesis? A loud American decided to eat at the Michelin-starred restaurant, rather than the rustic restaurant, and the staff decided to punish them because fuck them, that's why. And now they're famous among people who didn't even know what a Lecce was a week ago.
One does not accidentally go to Vespertine.