If you are referring to the topic about Local knowledge base note taking apps, I think the op is referring to local knowledge base note-taking it apps which seems to differ from traditional note-taking apps. (I am still confused about the difference tho).
This topic focus on introducing first party note apps to the notebooks section in PG.
When I was writing this I assume each OS comes with a local notes apps which doesn’t seem to be the case (excluding iOS and macOS).
I think it is still worth mentioning for that people’s as they tend to ignore the first party apps and go for third party apps (even though the first party app can have similar features to the alternatives).