I ate Edwardo’s several times a month on the south side in the 80’s and 90’s, as did a sizable number of my friends. This is back before it became a chain (I guess technically the south side location was the second location, so it was already a chain) and they decided to take the best pizza on earth and make it mediocre-to-poor for a mass audience, which I guess happened in the early aughts?

So there is at least an existence proof for deep dish very much a thing for south side kids when he was in the vicinity.