That was me
You might be right, but it still looks to me as if it was intended to be a station entrance.
Inside the Old Hall Street entrance, there are some large, newish, white doors that would give access to the ticket office (which is considerably larger than it needs to be, and its old design had a booth in the center and barriers on either side. Almost as if the room was designed to be split in two, with one side for the northern line and one for the wirral line (there is also an alcove for a 4th escalator)
I remember reading that the new loop & link stations were intended to be large stations, but that budget constraints put an end to that, with Moorfields the only one being built before the rationalisation kicked in.
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