I have read Peter Brinkmann's abstract (http://www.uni-weimar.de/medien/wiki/images/Embedding_Pure_Data_with_libpd.pdf)

And it says "When Pd was designed, uniprocessor systems dominated and editing operations were therefore included in the pd process. Now the opposite is true, so splitting up operations onto multiple cores makes more sense."

Does this mean if I embed pd patch into other language with libpd, then pd can be processed by multiple cores?

You can utilize more than one core with just Pd. See attached paper 'Multiprocessing for Pd' by Puckette. If you are using Libpd, then yes to that too.

http://www.pdpatchrepo.info/hurleur/multiprocessing.pdf