No offence intended but it´s old news to the world that a lot of Americans consume horrible trash food and drinks every day until they become morbidly obese and worse. It´s in fact one of the most commonly known stereotypes about the USA. So there is really nothing on the picture a euro mind could not comprehend, more like the contrary.
To answer most of your questions, it's Casey's breakfast pizza (bacon/sausage, egg, and cheese), it's delicious. No, soda (some of us call it pop) for breakfast is weird even for us. The lot is huge cuz a ton of people here have large trucks, RV's, etc. And yes that medium soda is huge
Casey's pizza is actually really good. Their breakfast pizza is awesome, but I when I actually get it I'll order a whole large and share it with the fam for dinner. Bacon or sausage would be the two options in the warmer. They are out of Ankeny IA I believe, but are in small towns all over the Midwest.
The hardest part to wrap your European head around would be four servings of sugary soda for breakfast, but how many people do you know that drink cups and cups of builders tea that is more sugar and milk than tea?
Neither side is right, humans can just be gross dopamine chasers in different ways. Compare the 'pizza' to a sausage roll, or whatever buttery monstrosity the French enjoy.
This must be the east coast's vision of a Midwest breakfast. Typically it's 2 hot dogs with coney sauce and a 2L of Faygo for $4. Pizza and Pepsi is strictly for brunch.
I was shocked at my first business breakfest with a American customer a number of years ago. At 7am while I drank coffee, he was guzzling down Coke. It was the first of the 4 he had each day. He usually cut himself off after lunch he said.