They never said content was stopping. THey're just going to be leaning more heavily on CBU3, using staff only as needed, for the benefit of the people who have only been working on this game for a long time. For such people, their experience working on decades old tech doesnt translate well to other things.

Personally, I'm largely in the same boat. I've been involved with an unreal engine 3 game for almost as long and now unreal engine 5 is coming out, and I've barely even used 4.