Thank you for noting that distinction, one which certainly was made also by the good Cardinal.
One of the best ways to begin with understanding Luther's view of Mary is Luther’s Marian hymn, completed A.D. 1545, one year before his death.
Luther scholars frequently—generally correctly—differentiate between “young, Catholic Luther” and “old, Protestant Luther”. Well, here is “old Protestant Luther, some 28 years after posting the 95 Theses sounding very Catholic indeed:
To me she's dear, the worthy maid,
And I cannot forget her;
Praise, honor, virtue her are said,
Then all will love her better.
I seek her good,
And if I should
Right evil fare,
I do not care,
She'll make up for it to me
With love and truth that will not tire,
Which she will ever show me,
And do all my desire.
She wears of purest gold a crown
Twelve stars their rays are twining,
Her rainment, glorious as the sun,
And bright from far is shining.
Her feet the moon
Are set upon
She is the bride
With the Lord to hide.
Sore travail is upon her;
She bringest forth a noble Son
Whom all the world must honor,
Their king, the only one.
That makes the dragon rage and roar,
He will the child upswallow;
His raging comes to nothing more;
No jot of gain will follow.
The infant high
Up to the sky
Away is heft
And he is left
On earth,all mad with murder.
The mother now alone is she,
But God will watchful guard her.
And the right Father he.
Obviously the term "Protestant" indicates that the adherents were protesting CERTAIN practices and beliefs of the Catholic Church and as the Reformation advanced Reformers added to the list of tenets they were protesting. However, it must be noted that most of the major tenets of Catholicism (the Incarnation, the Divinity of Jesus Christ, the Resurrection and Ascension, the Trinity etc.) were NEVER questioned (though I have recently come across some non-Mormon Christian FReepers who disavow the Trinity).
As best I can tell, Protestant problems with Catholic Marian teachings were almost nonexistent until the Immaculate Conception was made dogma in the mid-19th Century and much of this is based upon total misconception of what the Immaculate Conception actually is.