That is not true. Even the Catholic Church admits that God is not limited in His options. Salvation if from God, and with God all things are possible. The Orthodox Church echoes the Roman teaching that salvation is made possible in the (One, Holy, Catholic and Apostolic) Church.
Luther, on the other hand, taught that salvation is only in Christ and not in Church -- in line with his pathological denial of any ecclesiastical authority -- completely dissociating Christ from the Church, denying that the Church is the Body of Christ.
Of course. You got it exactly right, but given that the thing was explained to Harley many times, I allowed myself a bit of levity in 556.