If you want to be a jerk about it, tomatoes aren't native to Italy, so there is no such thing as authentic Italian pizza if it includes tomatoes. Before you get wrapped around the axle, it's just like authentic chili can't have meat in it because the Maya first called a loose soup made of dried chili peppers chili. Forget the "if there are beans in it, it's not chili" argument, if there's anything other than chiles and water, it's not chili. Don't even get me started on ketchup in America...
Food is part of culture, names for food are part of culture as well... and all culture is appropriation. There is no such thing as "authenticity" when it comes to food, it's all a matter of individual preference and popular inertia. I personally think McDonald's is making a mockery of what a hamburger and french fries are supposed to look and taste like, but it doesn't matter what I call them, it's a hamburger and fries on the menu and it will stay that way.
You can set your marker down on thick crust, pan cooked pizza as "not pizza", but it's just an opinion. In the mean time, I hope whatever food you like and whatever name you call it is delicious and satisfying. Life is too short to quibble over terminology.
“I personally think McDonald’s is making a mockery of what a hamburger and french fries are supposed to look and taste like, but it doesn’t matter what I call them”
However, a McD’s burger and fries, or a BK burger and fries, etc... are completely recognizable as a burger and fries whether you like how they taste, or not. Your example makes my point. Chicago and Detroit “pizza” does not look like pizza. They look like what they are, CASSEROLES. Not pizza.