I think your problem is in thinking that the list is intended to be a litmus test for opinions. For instance you said "much less accuse others who might reasonably differ on any of these points." which indicates that you want to be able to point to one of these items and tell someone they're wrong.
This list is just a starting point for you to question your own opinions. Of course it's subjective, I don't think introspection is ever intended to be objective. As a starting point for introspection the list is fine; as something you could ever apply to someone else you're right it's completely worthless.
Also, what paradoxes were there? In your first post you complained that the list was subjective (which it is) but now you're saying that it contains paradoxes without ever saying what those paradoxes are.
The author has stated as his main purpose the acquisition of truthful opinions, and avoiding delusion with groupthink and such. "Objectivity" is, I believe, the generally accepted name for such a pursuit; and introspection with such an object is a perfectly valid activity. Hence the main paradox of the article, which is that the author doesn't seem to have engaged in any form of such introspection before writing down these unstructured, and pretty much useless, musings.
This list is just a starting point for you to question your own opinions. Of course it's subjective, I don't think introspection is ever intended to be objective. As a starting point for introspection the list is fine; as something you could ever apply to someone else you're right it's completely worthless.
Also, what paradoxes were there? In your first post you complained that the list was subjective (which it is) but now you're saying that it contains paradoxes without ever saying what those paradoxes are.