I suppose when one realizes they are inauthentic, they at the same moment become authentic in their awareness of their actual inauthenticity. Paradox, lol. But is awareness enough on its own accountable for our state of being? I think not. Awareness is at most a result of being in a state of being.
By shallow I am speaking to the shades of grey. In my life, my beliefs and disbeliefs are measured against each other ie I don't have hard absolutes in my beliefs being I'm agnostic. I always have a measure of both belief and disbelief on any one whatever. I doubt I have exceptions to this rule.
So shallow for me would be neither hot or cold, neither strong or weak, neither right or wrong - the two opposing values would tend to imperfectly cancel each other out - no depth in other words.
This means I'm both authentic and inauthentic in my experiences of self when I don't have faith in myself.