TerraE was never wound up. It still exists and is now managed by BMZ who are planning to spend 300M Euro to get into production.
https://www.bike-eu.com/home/nieuws...7.1642111555.1545909080-1458595171.1545909080
The reason Magnis never acknowledged TerraE winding up is because it never happened. The graphite supply for TerraE still stands.
Here is the official TerraE website with this news.
https://www.terrae.com/2018/11/28/terrae-on-the-way-to-the-first-german-cell-production/