No.
Nasu said that about "Chaldea", that Part 3 may be still about Chaldea, or not.
Kadoc is part of Chaldea too.
- - - Updated - - -
I bet Olga herself would be focus of very last 3 chapters or something.
See Goetia. A radio silence until final fight with Solomon, when it's finally explained who he is and what does he want.