If I'm not mistaken the Green Hills "Integrity" OS is used in HP's iLO which has some [1] interesting [2] flaws [3]. Maybe these are all HP's fault, maybe they are partly due to the way "Integrity" works but it would be highly surprising if "Integrity" is indeed blameless.
So, "Integrity, unfit for national security" and "Integrity is insecure" are probably just as "true" as the statements made by the above gentleman.