Removing the template will remove the category and the sticker from the profile. To ensure all who may be interested see this, you should tag the profile in the Question.
1. Does a project account exist as a Manager of the profile? If so, then you should consult with the project before any changes are made.
2. If no project account exists on the profile, and the contributor is not a normal editor to the profile, and did not provide a source, it will be OK to remove the template. I would also leave a comment on the profile in question asking that before the template is added back, that it be sourced and verified first.