Indeed, I should've used the term Abstract Data Type (ADT), not data structure.
Still, I don't think that LinkedList refers to the way it's implemented. For example, it's not uncommon for a tree to be implemented as two arrays: one to hold the index of the parent and the other to store the actual data. Such data structure could still expose all public methods as a tree, and you wouldn't have to know how it's implemented.
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