Yes, I'm aware that it's made with hazelnuts. But in order for someone to refer to it as a "hazelnut spread", hazelnuts would have to be the dominant flavor. They're barely there at all.
(Compare the consistency of nutella to the consistency of peanut butter.)
We are discussing in the context of what people use in everyday language. In the U.S., the use of "hazelnut spread" over Nutella is exceedingly rare. Even when dealing with an off-brand, non-nutella "hazelnut spread".
(Compare the consistency of nutella to the consistency of peanut butter.)