He said it was unfiltered. If I was giving out some of my unfiltered thoughts, I don't think I'd want them floating around the Internet for anyone to read at any moment.
If you look at the link, that's what he actually says.
Sometimes these notes are not things I want to share with the whole world, but might be helpful for a few people.
So what do I do? I release them, but only for a limited time. I also put on a price tag — not because I expect to make any money, but so that only those genuinely interested will read it.