Great Pronunciation Guide? Or Greatest Pronunciation Guide?

There's a local pizza chain here named Zeppe's and on the wall next to the counter, they have a poster with their origin story.  I have never read the story, though, because my eye is always drawn to one particular passage.  The restaurant's namesake was named Guisseppe, Italian for "Joseph", and pronounced... well, I'll let the poster take care of that part:



That's the best they could do with that first syllable? Do you think it was a prank by someone? It has to be, right?