Huh? That is far above the average developer salary. Even in a big city this would only be plausible in a highly demanded specialty and high experience level. Far from average.
Sounds like an outlier to me, unless you can provide some statistics.
The highlighted average range is 5k to 6k gross, which comes out as 4.2k to 5.2k net.
5000€ average would seem about right if it was pre tax & social security -- perhaps OP got these confused and it's actually the pre-tax income.
If jobs are limited, then it feels a bit disingenuous to use this as an example. Please correct me.
But remote work in software development is pretty widely accepted in Germany, too.
That said, especially in the countryside, there are a lot of companies actually building or producing stuff. And they need IT services, too. Any food batch that's not properly accounted for in your warehousing software is effectively unsellable and, thus, a pure loss.