My thoughts about this as follows:
MOM did not specify how they concluded the 96,000 or the 700 data. I don't remember completing MOM/Dept of Stats surveys on employment etc, so my guess is the data came from CPF Board for new contributions by businesses.
If that is the case, then the 58,700, 82,900 and 96,000 can be explained - these were "jobs" created by businesses in order to claim the PIC cash grants!!! So a lot were the phantom employees declared by the businesses for Jobs that did not exist and probably names that had a second or third CPF contribution.
PAP probably aware of this and used it to their advantage for giving good SG50 news.....