I'm not that poster but everyone is wired individually, though - and even the diagnosis of anxiety will affect people differently. Trauma effects people differently.
And humans can be very contradicting.
I am very confident and hold seminars, host large events, in my role I do lots of public speaking, I interact with many different people with ease.
But I was/am diagnosed with agoraphobia (as well as c-PTSD due to childhood abuse and then a violent attack in my teens).
I'm 90% recovered from both but some core fears are now part of me.
For example, I'll be happy next month to get on a plane and speak at a conference, as I'm going with a colleague - I'd never be able to do this alone though, the anxiety would make me physically ill.
It makes no sense on paper! I can speak publicly but I can't drive to a place I haven't been to before my myself. Parking gives me horrible anxiety. I force myself, but it's tough and draining.
I'd rather speak in front of any amount of people than drive to the next town for something.
Some things I'm comfortable with, certain things I'm not.