The VO doesn't just 'go through all CSE' =)). The case analyst now needs to verify all that new information and update it in multiple places. This may in turn lead to increased processing time and even an ADR.
This one is definitely not true =). I don't know what's up with super fast PPR's for Nigerian applicants, but biometrics requirement has no correlation with application processing speed. I provided my biometrics back in November, however, as of now, I'm at the same stage as everyone else from biometrics exempt countries.
I do not recall seeing any field on GCMS notes or application for workplace contact numbers or addresses. IIRC, only city and state are to be filled out. So there is no place to update this as they were not provided in the first place!
In either case, the person says that the HR's contact number remains the same (I missed this when reading) so I do not think it is necessary to send CSE as there is one working number on the reference letter that they can use for verification.
As for the biometrics thing, without actual data we cannot say. I have based this on the fast PPRs being given to Africans (not just Nigerians but other nationalities such as South Africans, Cameroonians, Moroccans, Algerians etc) this year & AFAIK biometrics was implemented for all African countries this year. It could be something else though, such as applications going to a LVO that isn't as burdened as Ottawa.
It also makes logical sense... why would Canada spend hundreds of millions of dollars implementing this system if there was no benefit? Everyone gives biometrics at the port of entry anyway.