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 nuclearpowered cats but that does not mean that my employerprovided account or my Wikipedia account are used by more than one person In the event that its 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 Thats entirely adequate