Member X creates a discussion.

Member Y posts in that discussion.

Member X deletes his post.

Does “member Y” then appear in the Topic Starter column?

Delete your post and see.

Once a topic is replied to, the topic starter cannot delete their original post, because in doing so, they would delete the posts of others, which is something no non-admin member has the permissions to do.

I would then know, but, depending on the result, others might be confused.

I’m guessing that member X can’t delete his post. I hope that’s the case.

A member may delete their own posts, with the one exception stated.