This isn’t “Nazi paraphernalia”, it’s figurines in historical accurate uniform.
Section 86 of the German Criminal Code (StGB) doesn’t forbid this in Germany, rather - “it is forbidden to distribute, produce, trade or make publicly available on data storage mediums propaganda materials of unconstitutional organizations in Germany”.
See photo of German model shop selling these in Germany. They aren’t propaganda materials.
The law does extend to, “propaganda materials are also banned "which, according to their content, are intended to perpetuate the aspirations of a former National Socialist organization."
So I suppose if they were sold specifically to re-enact WW2 battles with Germany the victor, to be followed by a march holding aloft the glorious victors before a reading of Mein Kampf, you might be on dodgy ground.
But historical military displays? Seems OK under German law.