The source is somewhat trustable mainstream but not really good, as already the headline is wrong. The other person was not jailed for insults against the rapists, but threats of violence. And that is a attack on the state monopol of violence itself, hence the harsh sentence.
But indeed, the rulings against the rapists don't seem allright and very much out of balance with the other sentence.
It appears that the ruling regarding the rapes was not so straight forward [1], certainly not something that you can use as a one-line argument. There are also other articles describing what presumably happened there in 2020.
Regarding the case of 'Maja R.', here's a summary [2] (e.g. she didn't show up for the first two hearings [3] - that would certainly raise the anger of the righteous if somebody not in their favor did that).
I'm in doubt whether this one case is sufficient to prove the downward spiral that some people claim to perceive (it was also brought up in context of migration here on HN recently, and from the sources which I could find I‘m not sure it fully qualifies there either).
[1]: https://www.mopo.de/hamburg/details-aus-dem-prozess-darum-ka... [2]: https://skeptics.stackexchange.com/a/57113 [3]: https://www.mopo.de/hamburg/ehrloses-vergewaltigerschwein-20...