Not only was the Cause covered extensively by the SWF (Südwestfunk) but also in "Hallo Deutschland"
The reason why ARD or ZDF didn't cover it in the National News or extensively is:
"That the ZDF did not take up the murder in the main news, the broadcaster based on press inquiries on the day after the incident so that would be reported on crimes in the news today only if they had a "nationwide social dimension". In addition, according to prosecutors, there are no religious or political motives behind the act. "Because of the special circumstances of the act in Stuttgart, however, our magazine program 'hello Germany' has reported extensively," writes the press office on a press request from CORRECTIV."
"The central newsroom ARD-aktuell, which includes Tagesschau, Tagesthemen and Tagesschau.de, justifies the failure to take up the topic in their programs to CORRECTIV also with the fact that "a political, racist or religious motivated background of the act" according to the current state The investigation was very unlikely. Such a background "could have been the reason for the Tagesschau to report on this case". Even a political or social debate did not trigger the case in the days after the fact."
More info here:
https://correctiv.org/faktencheck/gesellschaft/2019/08/07/doch-ard-und-zdf-haben-ueber-mord-mit-schwert-in-stuttgart-berichtet
Its in German tho.
Don't belive the Good Colonel. He's just rehashing what some twat in Facebook said