@ky You are obviously new to here or the corporate world, that or your a boomer and don’t know how technology works.
Managers with 5 or more direct reports can see comments, so director could see all comments if they have several reports with under 5 people.
People tend to talk and type text very similar. So a manager/director can see a comment and isolate it to one of their direct reports especially if the comment was about one of their questions related to them or their manager.
Plus … if you use the corporate computer or phone to take the survey which almost everyone does, and decide to leave a comment it can be traceable that way as well.
People get fired here for less than a bad comment on the survey but it’s NOT 100% anonymous - nothing is fully anonymous in this digital age.