What makes me say that is that it is extremely regular from 8am to 10pm, 7 days a week. It looks a lot like a single person waking hours. If people did that as a day job, it would be more like 9am to 5pm, monday to friday. During their free time, it would be the opposite. For an international team, we would see activity around the clock. Hard to match such a schedule with a team.
And if they are indeed getting paid, the organisation might have an important turnover. By using a single account (or multiple shared accounts; I doubt there's only one), you keep the 'prestige' you have built.
Your 1 week old new recruit can edit texts left and right while most people think it's a legit old wikipedians tidying stuff up.
He managed to tick off some people who have the opposite political opinion. Those people also edit wikipedia with a personal agenda, and they are unhappy to be up against effective opposition.