I don’t think Luther accepted it.
“I don’t think Luther accepted it.”
Luther accepted it. That was a burning issue amongst others with him.
By 1541 Luther was physically sick much of the time, spiritually-battle-scarred, and frankly just old and cranky. Most of the stuff Lutherans apologize for by Luther were written in the 1540s, the last years of Luther's life which ended in 1546. The "sides" were being drawn up by this time, not just between Catholic and Protestant, but already amidst Protestants, and lots of blood had already been spilled--usually in the name of punishing heretics.
In my opinion the 2nd generation of the Reformation--starting in the era of the Roman Counter-Reformation, was incredibly destructive to unity, in the name of orthodoxy, on all sides. The Church catholic has been desiring to get back to something like Regensburg for a long time....