Just to make this absolutely clear, Egosoft is sending the gamefiles simultaneously to Steam and GOG. So it's not really Egosofts topic.
And a delay by a day or two is no big deal for me. But if you have to wait several weeks after you bought the DLC to, well, download it (like with Timelines), that's a big deal. To advertise and sell something, that you don't have, is bad business.
So, and now, I have to check whether there are updated german linux files and the Hyperion or still nothing.

Now we have the begin of march and for the German Version is only the Main-Game available in Verion 7.50.
All DLC are for 7.1 Hoffix 3 and Hyperion is not available.
For me this is very strange as on Steam the full game and all DLC's are also available in German, especially as Egosoft is a German Studio.

The DLCs have no different language. Take the english DLCs with the german base game. In english Hyperion ist already there, so you're good to go.

But yes, especially because the only difference is the language of the installer, there is absolutly no sense to delay the german DLCs so long.