There's no need to interpret anything. It's spelled out in the list in the Timeline section already. Point 1 tells you it's in Edge. Point 2 tells you that stable will be able to start migrating with 3.23, ie when current Edge becomes stable.
I am not seeing the same thing as you. The timeline section says that if I install 3.23 it will be user-merged and if I upgrade from an older release I wont be forced until 3.26. There are no dates. A timeline will have times and/or dates. Perhaps it is a CDN caching issue.
Bender|5 months ago
Arnavion|5 months ago
>>Release of Alpine Linux __3.23: [...] From this point onwards,__ users are encouraged to migrate existing installs.