A question related to writing of SoP
Since the SoP is intended to detail your goals and path ahead, you could say something similar to that if those topics support those goals specifically. But if those courses are also in your CV or transcripts it will also be known that you have studied those things. 

However, detailing that you studied them as a doctoral student is less useful. But, after mentioning your intended sub field of study you can certainly say that you have taken certain advanced courses in that field. 

But in general, make the SoP focus on the future, not what you have done in the past. Other parts of the application will detail your past accomplishments.