As this topic seems to be of interest again, I just searched for some more information and found it to be a topic covered by the press quite extensive. The next one are a selection only (sorry all German only):
Very thorough report and factory-visit:
https://www.handelsblatt.com/unternehmen/it-medien/gigaset-smartphones-made-in-germany-kann-das-funktionieren-/22769532.html
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