Translators: first off, thanks for the chapter!
May I suggest something? Given "Katastrophe" is feminine, "Schwarze Katastrophe" (with an -e) sounds better.
On the schwarze Katastrophe, here's my hypothesis: the inhumans are not from outer space, they're the product of Earthling genetic engineering. Reasons:
1. Fox ears, lion head, bat wings, flowers... if the inhumans are from outer space, why do they resemble native Earth life so much?
2. They cross-breed with humans dammit. This shows they're more related to us than even chimps are.
3. Four ears look like a clear design decision to appease human aesthetics. (Human skulls get weird when you have no ears on the sides, even if you plop them at the top.)
If that's correct they're as "native" to the world as the humans, and the schwarze Katastrophe wasn't caused by the inhumans - it was caused by humans. The inhumans would be either the tools humans initially used to fight, or a consequence of the sK.