Not to mention that no one hires DBOs, they hire Junior DBAs (sometimes)!!

There's my 2 cents.
Well, it might be a surprise to you but I know an OCP DBO who is the main DBA at a rather big company (the term Senior DBA does not exist there).

And I wouldn't trust very much what a Director of the OCP Program at Oracle would say. There are things thyey can say and things that they cannot say.