To summarize this affair because I wager even deepl won't help much (I wrote that article):
There had been 2 bans by lower regional courts in 1994, one by a Munich court and the other one by a Berlin one. The courts banned versions of the game on the basis of the usage of outlawed Nazi symbols and somehow because it would classify as dissemination of Nazi propaganda "directed against the free, democratic constitutional order or the idea of the comity of nations"; sections 86 and 86a of the German penal code: https://www.gesetze-im-internet.de/englisch_stgb/englisch_stgb.html#p0868
The federal agency called BPjM promptly placed the game on the so-called index of media considered harmful to the youth in 1994. The panel evaluating the game explicitly stated they were unable to judge whether the Nazi symbols may further right extremist views in young players, however they deemed that its content would glorify vigilantism and provide a positive view on violence.
25 years later, the BPjM's decision was about to lapse in accordance with the law. However, they decided to further blacklist the game because of the old court ordered bans in accordance with sect. 86 of the German penal codes. Those bans have actually lapsed long ago, in 1997 and 2004, but because the German lawmakers decided to phrase a certain passage in a certain way the BPjM believes they are justified or rather obliged to blacklist media in those cases anyway. If the rightholders don't have the court ordered bans challenged, this could go on forever.
However, the court orders have been challenged and lifted, and thus the BPjM no longer sees any reason to blacklist the game further. (The game's violence is by today's standards no longer deemed to be so much problematic, so this is no hinderance either.)
Because the court orders apparently only got lifted because of legal formalities, the legal violations the game was once accused of (or rather the people involved with dissemination and production) not actually being denied, and the BPjM for some quirk in the German law not checking whether a game uses Nazi symbols legally in accordance with § 86a of the German penal law, it's still somewhat unclear whether the game might be offered legally in Germany though. Would be best if it'd be submitted to the USK, Germany's rating board like PEGI or ESRB.