This is a dishonest post.
A truther believes that the government was involved in the plot to murder thousands of Americans.
The comment in the article does not indicate that Ron Paul believes that. He might believe that, but the comment doesn’t prove that.
His isolationist foreign policy positions are certainly open to criticism, but this post is not honest criticism.
Means, Motive and Opportunity.
Paul is discussing Motive.
It may not be an overt Make It Happen On Purpose truther, but he is generally in line with the Let It Happen On Purpose side, even if he keeps his language ‘political’.