Within the canonical answer on how-do-comment-replies-work it is clear that post editors can be replied to.
Notifications apply to the author, users with active bounties, commenters (associated to current non-deleted comments), and editors of the question or answer that you are commenting on—users not in that list cannot be notified. You can also notify a ♦ moderator who closed the question. The question and answers are all considered independently. For example, if Alice was the author of, commented on, or edited the question or her answer, then you cannot notify her by commenting on Bob's answer (unless Alice also participated in that answer), and vice versa.
However, thanks to this comment by Shadow Wizard, it has become clear that this only applies to approved editors (in addition to binding editors). I wish to request that comment replies be extended to include any user who suggested a rejected edit on the post.
The reason I would wish to reply to a rejected editor would be if their edit, while inappropriate, hinted at important information; for example that the answer was wrong or incomplete. In those cases I may wish to encourage them to outline this in a comment or competing answer.