All Wikipedia editors are pseudonymous, and I thought that this article was referring to IP editors not logged into an account, which are conventionally referre

All Wikipedia editors are pseudonymous, and I thought that this article was referring to IP editors not logged into an account, which are conventionally referred to as "anonymous" by the community, but these were indeed editors with accounts, and those are more easily trackable with more accountability. Even if a person opens/uses more than one account, they can be linked and correlated. Except this may also have been a case of "meat puppetry" which is a difficult abuse to identify, especially if they're using a private means of coordination, such as emails. Wikipedia is constantly confronting the huge problem of UPE (undisclosed paid editing) and there are very strict rules around it, but not as strict as you may think: it is not prohibited for a paid editor to make changes to articles. It is, however, forbidden to edit without disclosing one's paid status, so this kind of "stealth airbrushing" is a bad look for anyone, powerful or not.