Since the smug O'Leary crowed about how he 'raped' Boeing over aircraft orders immediately after the 11 Sep 2001 terrorist attack, it's hardly surprising that they aren't prepared to offer such low prices to O'Leary's tawdry airline again.
Boeing have obviously learned that "If you sup with the devil you need a long spoon"!
Boeing and Airbus can survive without Ryanair; one wonders whether the converse applies?