It wasn’t until the last 200 years that Mary was announced to be immaculate. And it was until 1965 that Mary was proclaimed the Mother of the Church.
This was well after Martin Luther’s time who I’m sure would have disagreed with both views.
Did you not read the article?
It is a sweet and pious belief that the infusion of Mary's soul was effected without original sin; so that in the very infusion of her soul she was also purified from original sin and adorned with God's gifts, receiving a pure soul infused by God; thus from the first moment she began to live she was free from all sin" (Sermon: "On the Day of the Conception of the Mother of God," 1527)