I have been asked to comment here. Topic bans are considered quite extreme measures, and usually taken after other steps have failed. I am not even sure if a solitary admin can impose such a sanction without discussion and consensus on WP:ANI. What a solitary admin can do is issue blocks for unambiguously disruptive behavior, and obvious misrepresentation of source material to create bias certainly comes into that category. Since receiving the note on my talkpage, Knarum has not edited this article, so at the time of this writing, taking such a measure would not be appropriate, the problematic edits notwithstanding. Concerning Gabagool's comment, it is true that foreign citizenship and immigration have something in common since many immigrants hold foreign citizenships; but the terms are not equivalent as noted by Mabuska. If a source says "foreign citizen" we cannot substitute that with "immigrant", and vice versa.