To make this clear: Nobody in Germany requested a takedown of that subreddit. A German agency (BPJM) sent Reddit a letter with a few questions about that subreddit. Reddit then blocked the site for German IPs but it was not requested to do so.
The BPJM does not have authority to block foreign websites. They do maintain a (non-public) list of websites deemed harmful to the youth which e.g Google uses to not show certain sites to German users. They planned to add that subreddit to this list.
That's quite far from censoring but rather Reddit censoring itself.