The list of laws can be found here (German) https://de.m.wikipedia.org/wiki/Weltrechtsprinzip and almost certainly does not cover this.

However, you could try to argue that § 5 StGB 12 (Auslandstaten mit besonderem Inlandsbezug) applies https://www.gesetze-im-internet.de/stgb/__5.html

“Taten, die ein deutscher Amtsträger oder für den öffentlichen Dienst besonders Verpflichteter während eines dienstlichen Aufenthalts oder in Beziehung auf den Dienst begeht”

Now, all of this first requires that a crime was committed - and that’s not even clear. If the collection happened on the basis of a law, doing the collection would not be a crime. The article shows no proof that the Bundeswehr mishandled the data.

Also, the Weltrechtsprinzip doesn't seem to be specific to Germany. Is there something in its German flavor that is remarkable?