To be sure, the quoted text in the parent comment is itself the linked essay’s quotation of Paul Graham. Whether logically rigorous or not, that excerpt seems

To be sure, the quoted text in the parent comment is itself the linked essay’s quotation of Paul Graham. Whether logically rigorous or not, that excerpt seems to be the essay’s author’s way of rhetorically opening his reflections on the idea that writing verbally crystallizes thought. As a reader, I do not believe that the author is making a claim that the quoted Paul Graham statement, reduced to symbolic logic, is in all respects valid or sound.