I've estimated the processing time for the last stage (PR) in the SS based on 2009-10-11 files. It took 4~6 years just to get the sponsorship approval. Then it took only 2 years for LVO for PR. Note that, the last stage used to involve a lot of communications as well (asking for PR application package, medical, PCC, extra docs, RPRF, PPR). Yet, it took 2~2.5 years.
Now, none of the files from 2014-15-16 hasn't gone past Medical/PCC request. There is nothing much left after it unless they get into a queue for PR VISA after any pre-2014 files (remaining 2009-10-11). Even for that, it cannot take 5 years. Moreover, medicals are valid for 12 months and CIC tries to stamp the visa within this period.
The data available on CIC Processing Time saying that they are working on 2011 apps has been there perhaps for years. Since it totally denies that they are working on post-2011 files, it cannot be trusted. Obviously, CPC-M is a part of CIC and they're approving 2014-15-16 files. Again, since CIC did not give PR VISA to all pre-2014 applicants, it could be their shield.