If you are talking about the addition of microG, that indeed seems like it hasn't been mentioned on the blog, although I'd argue very likely due to an oversight.

I can find internal conversations that it deserves to be announced in a more prominent way than on the "Sunsetting LineageOS 18.1" post, was left as "to be added to the LineageOS 22.x" blog post, and then just never made the initial draft. Whoops.

If you are talking about the rules on the subreddit (or the other social platforms), that one indeed has been discussed a lot on the platform itself (and which we usually keep available).