SVN updates (for all versions of Tiki) will stop in January 2023. This coincides with when Tiki18 reaches end of life. However, even if you use another version (like Tiki 21x) from SVN, you will stop getting updates because the Git and SVN combined workflow will be retired. You should get your updates from Git. See also: Tiki Version control history.

CVS exploring
A good (then lazy) coder will put valuable comments in his CVS commits. You'll see those comments in each post on cvs mails, if you subscribe to that list. Each change on the code source sends a mail to that mailing-list. It's a large amount of mails, but less than for devel list. A good way to follow development is also to update a local cvs version of tikiwiki. Use the command cvs log on a file gives out its history of all comments made on it. Very useful. Please add the tracker id number if you ar fixing a reported bug or a feature request.

CVS : what's that ?
It's a way to store code source and write it collaboratively. It's used in all open source projects and it's a must know.