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

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