I don't quote know what it means either. I made a list earlier this week where I tried to define it, but I'm not sure if it really nails it (https://notepd.com/idea/10-ways-to-live-an-authentic-life-f7e9s). Regardless, it's only my definition. As I mentioned in the post, the definition of 'authentic' is entirely at one's discretion. I think it's too flimsy for everyone to agree on one set of parameters for an 'authentic' person. Nonetheless, I find it interesting to consider.