are they? Neither the transcript, nor their linked sources say anything about kurzgesagt. And I'm not watching the whole thing of they can't even be bothered to write a list somewhere.
Kurzgesagt started as a design agency, but I think they're doing only youtube (+ merch and their video game); I couldn't find anything about them being owned by someone else than their founder
I use Inoreader as my RSS backend, they have that feature. They provide an email address, and everything that lands in that inbox pops up in my RSS feed. So I have a rule in my email inbox which forwards all their emails to the Inoreader address
TSG doesn't really support integrations like that. There are unofficial workarounds, but they're prone to break. Adding an API is on their roadmap, but might be a long time in the future
I'm still utterly dumbfounded, why you used Forgejo v/ which is not even supported anymore, instead of the current v15 (LTS) or v16. Where did you find these binaries?