We get malaria from a parasite that is spread by mosquitoes.
We get tuberculosis from a bacteria that is spread by humans.
TB kills more than three times as many people every year as malaria. Why is malaria counted as a death caused by mosquitoes but TB isn't a death caused by humans? Either you count both or you count neither.
It is probably fair to count TB deaths in the "human kills" category, but I think we usually make a differentiation between human to human disease and disease caused by contact with an animal. It's just the way we see ourselves as separate from the rest of the animal kingdom.
Although I get what you're saying, I don't think that human deaths caused by TB is necessarily what people are interested in when you aggregate all of the of humans at the hand of other humans, which may be why those deaths are omitted.
They're saying that 1,000,000 is the number for mosquitos, not because they kill people but their a carrier of disease.
What they are asking is do we consider other animals in the same capacity, such as, does the number beside humans include human transmittable diseases (HIV for example).
Seems like a reasonable question.
Just to be clear, I think it's a perfectly reasonable question. A rational question can still contain a potential flaw.
But I did misunderstand what they were asking.