The Supper doesn’t depend on the faithfulness of the Church. It depends on the faithfulness of Christ.
A rightly-oriented heart and a rightly-oriented love will consistently do what is best for God and best for our neighbor, which is why St. Augustine speaks of sin as a disordered love.
For Bonhoeffer, Christ crucified, and the cross of the Christian life were not of peripheral importance, but foundational.

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Christ urges us to love our neighbor as He loved us, forgiving all of their sins - giving them the absolving, shirt-pulling, embrace that we would also want.
I am not a good Lutheran. I have only been around reformation theology for a few years.