No, it is not. I'm also german and rt.com is DNS blocked by the Telekom.

  dig @192.168.2.1 rt.com
  
  ; <<>> DiG 9.18.39-0ubuntu0.24.04.2-Ubuntu <<>> @192.168.2.1 rt.com
  ; (1 server found)
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 64757
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 512
  ;; QUESTION SECTION:
  ;rt.com.    IN A
  
  ;; Query time: 30 msec
  ;; SERVER: 192.168.2.1#53(192.168.2.1) (UDP)
  ;; WHEN: Fri Feb 20 09:17:58 UTC 2026
  ;; MSG SIZE  rcvd: 35