That's how that works. Take for example, HIV. Nobody dies of HIV, but because HIV causes immunodeficiency, you can die because of common cold or flu. That doesn't mean the person died because of common cold, they died because of HIV/AIDS.

Similarly if you have type 1 diabetes and you get infected with corona, you probably died with diabetic complications, but without corona you would have been totally fine.

Not sure how that doesn't change your point. In fact you are conflating two different things. On one hand you are arguing about overreporting and on the other hand don't even want to take into consideration common practices in disease statistics. Almost makes me think you are not arguing in good faith.