The information posted was accurate (and a direct quote); it's your interpretation of it that was incorrect. It does not mean that files received after that November 2019 date are not being processed and finalized.
IRCC's language 'we are finalizing most applications' received at [date] is a bit peculiar. The 'most' is a term iRCC uses to say 80% of applications.
Thus 'most apps finalized' received at [date] means 80% of those apps now finalized; presumably many have been finalized that were received after that date, but less than 80%.