Nor am I, but I know any personal opinion of Brother Martin to the effect that there was a purgatory, never made it into the Lutheran Confessions.
NL: if your earlier contention is that Lutherans believe Mary was sinless or Immaculately Conceived, that would be in error.
That’s a good one.
Lutherans no longer believe what Luther believed.
They have changed with the prevailing winds, just like all protestant churches do.