they will change or delete the bad post and send feedback to the poster to discourage them from making further posts like that. They may also give a warning or suspension to the poster.
The thing that’s confusing on this post is that they used “Feedback” and “Warning” in different meanings. But what is the difference between those? Feedback messages already do a job of a warning - to not do that again.
Feedback is a simple DM saying that you shouldn’t do something. I have never heard of a warning being issued though. Some content is outdated here. But if you want a more accurate response you should message the DevEngagementTeam regarding the rules.