It's officially sanctioned by the city, but it's capped to one request every 3 minutes to avoid replacing the official website. Every few months, I ask them for permission to add other services, and I get ghosted.
However, the tool is open source, so you can just `pip install` it and run it on any appointment type you want.
Your form helped immensely in the anmeldung process last year for me. Keep fighting the good fight sir.