As this is news from three weeks ago, the Handelsblatt since released like 10 further articles on the Tesla files. I didn’t follow them and on a first glance it doesn’t seem like there was something dramatically new in those, but I’d expect this podcast by Handelsblatt Crime from Saturday to summarize it decently for the German-speakers among us: https://www.handelsblatt.com/audio/crime/handelsblatt-crime-tesla-files-die-hintergruende-zum-datenleck/29184454.html