There is a thread related to this discussion. But I don't think the question has been satisfactorily answered even though it's closed now. So I thought it'd be a good idea to open the discussion again.
I encountered the similar issue that ReplicationActionType.DELETE doesn't actually delete anything from author even though I was pretty sure that I used administrator user to delete the node and there wasn't error in the server log. So I wanted to know whether ReplicationActionType.DELETE was designed to delete a CQ node from author and publish (if the replication is setup properly). BTW, I use AEM 6.
For the time being, if anyone seeing the same issue, there is a workaround to resolve the problem by using node.remove().