We don't know what "NATO certified" means. Many weapons are used by NATO forces, and only a few of them have that NATO designation. That doesn't mean that the SIGs, Glock, H&K weapons not wearing that designation are somehow inferior. We don't even know if there are, in fact, "NATO" tests that must be passed, or whether other standards having to do with production practices, are at play. Many of us have looked for answers to these questions, but have been unable to get any resolution.
Man, people just don't like Google these days.
Take it for what you will. As Walt mentioned just because the P01 passed these tests doesn't mean other guns, even other CZs, wouldn't also pass them. I wouldn't get too hung up on it.