Yes, if he received the Lord Jesus Christ as his Savior from sin, he has been justified by faith in Christ (declared righteous by God), and is forgiven of all his sins—past, present, and future—but his works will be judged (1 Corinthians 3:13-15)before the judgment seat (bema) of Christ.
From what I could find out about Mr. Tremmel, “he never broke his silence about what he did in the SS” (post #95);
I would think that true repentance could not remain silent.
Not sure about that.
The climate in Germany towards war vets is kind of odd, in most cases no one wants to hear about it. I have heard regular German vets say they had a kinder more sympathetic audience in US veterans and US history buffs then they did in their home country with the younger generations raised in the 1970s and alter.
Fact is German culture is much less about bearing ones soul and sins in public then the American culture. Much more of a stiff upper lip culture.
Ultimately none of us know what was in his heart.