If you write
@bob in a comment and bob edited the post, then bob will be notified of your comment. Yes, this works, even though editor names are not included in the completion list.
I think the rationale for not making this feature obvious is that commenting to an editor is discouraged, because it bothers the post author as well and it's likely to be the start of a discussion. But it is allowed, I think, mostly for the use case that you want: to allow the author to discuss an edit with the editor.
You can only ping editors that way. This includes submitters of accepted suggested edits, not submitters of pending or rejected suggested edits.