Thank you for the correction. That seems an impressive number, and indeed somewhat an indication of a lot of development work being done that is independent of Bitcoin. If you look back in the actual commits there were indeed many commits for clean ups, tweaks, etc., especially during the summer (around the time of the version 12 release), so the 2000 number seems to pass a quick reality check.
 
Are you no longer merging new Bitcoin commits, or is it planned to freeze for a while and then catch up at some point?