Unfortunately, all the pages with plug-ins were deemed unusuable as sources by User:Will Beback, regardless of context. I agree that the WordPress one should be valid as a source, but I also think the Barrett citation is solid enough to use. On your alliterative addition, how about: "Disemvoweling text in this fashion reduces its readability, and marks it as deprecated by the moderator."  This way, no judgment is made about the moderator or the disemvowelee being right or wrong in their respective actions.