Please mark the AI response as No to the question of whether it was helpful.
I'm not sure what the actual requirement is but if you simply want to have your name replaced by something else go to Word> Preferences> User Information. Replace the user Name with something such as Anonymous & replace the Initials with ANON. Be sure to check the Always use... box. Note that this will go into effect for any new Comments you enter but will have no effect on those previously inserted.
Note also that what you change it to also so will be used by Word in UserName fields, documents based on templates which automatically insert the user name, etc.