Double-negative confusion not withstanding, yes, the naming decision was pretty clear that the LSG decided that this is an "array":
The Language Steering Group did not feel that it was inappropriate for users to conceptualize this as an 'array' type in a colloquial sense. We agreed with the argument that 'fixed-size array' accurately captured much of the behavior of this type, even considering its relationship with the potential 'array' types that we may want to support in the future.
([Accepted with modifications] SE-0453: InlineArray (formerly: Vector, a fixed-size array))