It's likely a teaser for his new book - don't have access to the whole article, but see: https://www.npr.org/2019/04/19/714600205/einsteins-unfinishe... as an alternative.

There is a nice youtube video but in German. Maybe translated subtitle will help the less einlighted.

https://www.youtube.com/watch?v=xnJPy-lsZKQ&list=PLS5j2nq7Ag...