Never was German, maybe never even lived in Germany.
He was born in Poland, the part of Poland that Stalin took after he made the Hitler-Stalin pact. After the war Stalin kept that half of Poland and gave Poland a slice of Eastern Germany as a trade. When the USSR collapsed that land became Ukrainian.
So why should Germany take him?
The war against the USSR in WWII was certainly a German invasion, but it involved a whole lot more than German soldiers. Fighting with Hitler's army on the Russian front were
* The Romanian Third and Fourth Armies which fought very well at times including taking the city of Odessa pretty much on their own.
* The Hungarian Second Army that had to be kept separated from the Romanian Armies
* The Italian Eighth Army including some of their best mountain troops
* The entire Finnish Army which were a big help to Hitler
* There was a Croatian division, a Slovak motorized division and the Spanish Division Azul
And that's not even mentioning the Waffen SS Divisions which had large contingents of Dutch, Belgian, Danish, Norwegian, Lithuanian, Latvian and Estonian contingents all fighting in Russia. When Hitler killed himself, the Division still defending the government section of Berlin was the SS Charlemagne Division made up of French volunteers.
The concentration camp guards were rarely German. They were needed at the front. The guards were often staffed by Balts, Albanians, Croats, Bosnians, etc. Remember the last guard to be deported? John Demyanjuk? He wasn't German either. I think he was a Balt.