Don't confuse something you don't understand with sophistry. Painting a house is not "creating a painting" unless the house is used as a canvas to create art. In other words, all squares are rectangles, but not all rectangles are squares. Furthermore, what you are judging as "not poetry" is in this case, considered to be poetry by the poets (O'Hara and Tate), academics (including Tate, who is both a prize-winning poet and a professor of poetry at some of the best regarded poetry programs in America) and the publishers (who have published some of the most influential and beloved poetry of the era). So if it doesn't "wash" with you because you have an idea of what poetry "should be" though you don't seem to be well-versed in the subject, perhaps you might be well served to search out some of the many available articles in academic and literary journals to try to understand why it does "wash" with people who write, teach, publish and actually read poetry. Understand that poetic traditions across cultures vary greatly and to judge one culture's poetry against a foreign metric, is simply unworkable.