Yeah I agree, someone saying they don't want to talk anymore because they've already written about something stops it being a discussion and makes it into some sort of lecture but without the notes. If you're insisting on telling someone you wrote about the current topic of conversation, you can just mention it and carry on with it. Like authors who go on podcasts, they'll say "Like I wrote in chapter X, I think that..." - the conversation shouldn't be killed off. Comes off as a bit arrogant.

I agree. Mentioning blog in the end is probably a better way. Finish the conversation, chain of thoughts and then before switching over to next topic or when saying byes or even a day or two later send them your post. But not in the middle of a conversation.

Maybe I didn't get the nuance in the best way. I think it would be more in the vein of we've probably explored this topic as much as we feel like it at the moment but maybe we can continue the conversation via some more deeply-thought sources.