My dad has diabetes, a manageable condition that would allow him a reasonably healthy life for several more years. He is 81, which is old but both of his parents were in their 90s when they died.
The disease that put my father in the hospital for a month was not diabetes, it was COVID. He lost over 100 pounds during his stay in the hospital.
He is now having memory issues. OK he is 81 that's normal you say. But a month ago, he knew he didn't have a dog at home, now he thinks he does.
Yes co-morbidity is an issue, but not the issue. Blaming my dad's diabetes is like saying asthma patients that they died from asthma not smoke-inhalation after a fire.
Also, it is one of those really insensitive things people say when the problem doesn't directly affect them.