I don't think "security" is usually a binary concept, where it's either there or it isn't. It's more useful to draw an analog from the ratings of safes, which are along the lines of "it would take ___ hours / days to break this safe." Instead of lofty claims about being impervious to attack, put up obstacles and hurdles, that make attacks harder.
But those "obstacles" and "hurdles" can themselves be exploited in some cases. If they're software-based, then they can just end up making the attack surface much larger.
