Subjectivity does not arise on its own: it requires objectivity to trigger it. The initialising object may well be of similar substance to the ensuing proliferation but is still an object non the less.
It may help to see the practice as consisting of two steps. The first is to objectify subjectivity, simply by Knowing it just as it is. The second is to see the resultant object as not the Knowing. I.e. what is it that knows this. Don't know? That will do.