I've read the article 5 times and I can almost interpret it that way in the how to migrate section which mentions 3.23. The Timeline section has no mention of dates. I would like to see a table of dates or at least an Oompa Loompa song.
>>Release of Alpine Linux __3.23: [...] From this point onwards,__ users are encouraged to migrate existing installs.
To OP: this announcement from Alpine doesn't contain dates, like you've mentioned. This is apparently not an accident.