The country of Hungary goes home devastated. If I were organizing these world championships I would be so blown that two of the sport's biggest and most dominant stars have basically shrugged and said "nah. I'm going to focus on this other meet instead (next year)." I will give benefit of the doubt and assume the truth is being told here, but that doesn't make the presentation of it go over any smoother.
If it really is an injury then wouldn't that be enough of an explanation? Athletes miss championships for injuries all the time, I don't think the excuse of needing to prepare for the Games 12mo from now needs to be added on as a supporting argument for a minor injury. Ollie Hoare has a more major injury which may actually have overlapped with the Olympics if he ran through Worlds, so that makes sense to mention next year's championships as context. But a minor knee thing that might clear up soon but not 2-weeks soon?