like below fixes the issue See, a comment is a reply to a feed/post. So in your case, you don't need to comment, you simply want to post a feed to your page something like:
By : user3392093
Date : March 29 2020, 07:55 AM
This might help you i am develpoing the app which retrieve the logged user current comment on facebook wall and no of like for comments. , This should be all you need to get the logged in user's wall posts.