I will try to keep this short, since I prefer doing my work than talking about it

A lot of different reasons come to play here in my opinion. An update / expansion, even if it is as big as ours, rarely has the same news worth to the media as a new release (even if just early access). As mentioned by Matthew94, the initial reception by the media of X4 back in 2018 was a rather negative one, so re-building burned bridges is quite an effort. And wasted90 also has a point with the niche description of the series.
Having said that, games coverage has changed a lot in the past ten years. I'd say in order to attract new players to the series, streaming platforms, YouTube, social media and direct communication from the developer (for example via Steam, informing several hundred thousand people that have wishlisted X4) have become way more important than traditional games media. And this is working great in the first two days after release, with high triple-digit-percentage growth on hours streamed, videos viewed, mentions on Twitter etc. Something like
this is much more effective these days in terms of purchase conversion than a news on a website (I'm highly generalizing here, but I guess you get the point I'm trying to make).
Still, I'm working all different angles obviously, and we did have some nice coverage in the more traditional media, with just two big examples being
Rock, Paper, Shotgun and
4gamer. With media outlets of that size (both mentioned are among the biggest of their countries), we can actually see people coming from those articles to our Steam page. Since you specifically mentioned German game sites, keep an eye out for a Gamestar TV episode on us shortly.
Given all that content creator and community power - don't hold back on spreading the news yourselves
