I understand what you are saying...
But, all one has to do is look at who these promoter's of the "shift" are referencing (Thomas Merton, Henri Nouwen, Richard Foster, Manning, Eckhart Tolle and other mystics) to know that they are not making the distinction that you are talking about.
Additionally, why are protestant evangelicals even promoting the teachings and practices of Catholic mystics? Did the Reformation not happen? (no offense intended).
Also, in Lectio Divinia, at least how many/some practice, it is not just God's written Word that speaks to the practitioner through the process, it is actually new revelation that is given to the individual during the practice.
Thomas Merton ended his life in a Buddhist monastery. Henri Nouwen I know less about; I know his books are gooey.
I don't know why Protestants would promote Catholic mystics. Perhaps its an acknowledgment that the Saints who devoted their entire lives to Christian prayer might have something useful to say about it, even if there are doctrinal disagreements. A modern example is Blessed Teresa of Calcutta. She is considered by many to be a first rate mystic ... and all kinds of Christians can learn from how she persevered in prayer despite extreme desolation and temptation.
It can go both ways. I've learned a lot about the nature of Christianity from C.S. Lewis.
I think the "new revelation" thing needs to be defined. When I was practicing letcio, I read about the woman with the flow of blood, and I saw how this Scripture shows us the need to confess our sinfulness to God. Is "revelation" the same as "insight?" I really believe that God was behind this insight of mine. Lectio is supposed to engender "new" personal insight, not new dogma.