It is And not feeding a troll is a significant factor The editor in question was warned a year and at least 50 sockpuppet accounts ago that any further edits he made would be considered as vandalism and he has not stopped It does not matter per Wikipedia s banning policy that the edits are constructive the mere fact that they are made by a banned user makes them disruptive and requiring rollback so that the banned editor is not rewarded for evading their ban using illegimate accounts so that Wikipedia is made better and not worse If you believe this shouldn t be the case then please open a discussion at the policy page to change the policy In the meantime as a legitimate editor you are more than welcome to re add the categories yourself but please don t make personal attacks on editors and admins who are applying policy and discouraging trolls when you do so