If the seizure is TRUE, it would've been a SPECIAL OPS team that performed it, and that could be just about any branch of our military with the exception of the Coast Guard and Space Force. Could have been a U.S. 'CYBER SECURITY' agency as well.
If permission was received from the German government, then sovereignty concerns are irrelevant!
That's not how the world works.
First the German government would never permit that under any circumstances. Neither would we or any EU government.
This story would be more believable if it were the State Department and not the military. But the bottom line is that neither the US military or the State Department has any authority to seize anything in Germany, zero.
The story is bogus move on.