Speaking on behalf of the subject of an article is a conflict of interest, not a role account. The first person plural may be a figure of speech, particularly when relating to a school. To give a parallel example, I routinely refer to my employer as "we" ("we are the most profitable manufacturer of evil nuclear-powered cats") but that does not mean that my employer-provided account (or my Wikipedia account) are used by more than one person. In the event that it's not just a figure of speech in this instance, then the editor has already been advised about the policy in the discussion thread you mention. That's entirely adequate.  (talk)