" is is a plain statement of a past event/situation. " implies that his not producing enough papers happened before some other past event that is relevant in the context. " The past perfect helps to emphasise the sequence of events in that sentence but it is not mandatory.
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imzy1. "He did not produce as many papers as the university wanted him to"2. "He had not produced as many papers as the university would have liked him to"You are dealing with the idiom would like. The grammar of an idiom is not always the same as the grammar of the same words when they are not used in an idiom, so the answer below is not necessarily