I had a similar update before the February 1st security patch update, it came after the Android Pie update but stayed on January 1st patch, there didn't seem to be any changes either.
Iam in India unlocked version of note 9...there are few changes I guess.. One I noticed was in notification panel call tab is full green color now... Hope the the dolby atmos bug is fixed... Mine use to switch off on its own
Last few security updates I have gotten within the same month but still nothing from February, however I have gotten a load of updates lately from both Samsung and play store so I wonder if it is a run up to the Pie and One UI that I'm supposed to get this month