I think he means publishing isn't worth the effort,since he has an offline notebook for writing still.

Unless you think actually going through with the work of making something online is worth the effort.

In my experience, it's the act of writing for someone else that makes me learn the most. It helps clear out the assumptions I had which I had been satisfied with but didn't actually have the evidence for. When writing for myself, I don't think about the assumptions as much, but when writing for others they become a lot more evident to me.