You should read his full paragraph. He even quoted the DOJ. Your point doesn't make any sense with regards to his statement. His statement was that the DOJ claims Apple was harming the consumer by not allowing customers to do price comparison.
I didn't knew that Apple has released a iBook app for the Kindle or the Nook.
By the way, you can buy books from B&N using the Nook app in the Kindle Fire and you can buy books on the Nook using the Kindle app.