Breakfast cereal is "ultraprocessed" by the definition of the article. But Grain Berry cereal is going to be grossly different from a nutritional perspective than Frosted Flakes. For both to be lumped into the same category of "ultraprocessed" is a bit ridiculous.
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Its not like "processing" makes something more or less poisonous. 100% all natural fully organic death cap mushrooms will kill you.
Now high-fat, high-sugar, high-salt, high-preservative stuff is probably bad. Those things have clear science and nutrition issues associated with them. But the nutrition in "processed" canned corn (picked and canned at peak ripeness) is often found to be superior to "fresh" ears of corn (which loses nutrition the longer it sits in the food aisle).
If you cook all-natural brown rice with fresh pork-belly all day every day, and you'll have a heart attack from all that fat you're eating. It doesn't matter if that pork-belly is ultraprocessed bacon or freshly cut from a squealing pig in your backyard: pork-belly contains a ton of fat and is just innately unhealthy.