Grammatically, the passive voice also places the active participant as an explicit indirect object rather than the subject. A sentence without an explicit indirect object is not in the passive voice.

It may still have some of the same problems of communication which motivate people to work to avoid the use of the passive voice, and may even go further than the actual passive voice in those problems in that rather than deemphasizing the actual actor -- as happens when that moves from subject to object -- it omits the active party entirely. But its still not in the passive voice, despite the similarity in issues that arise.