I've never heard of that before, but it sounds right. I think it comes down to allowing yourself to feel all the terrible symptoms of anxiety and being totally okay with it at the same time. If you're in a very anxiety producing situation, allowing yourself to feel the heart racing without those thoughts of "oh no, oh no, its coming, everyone will notice I'm nervous." allowing yourself to even shake or stutter without that intense feeling of judgement.
Allowing it to be okay for these things to happen, no matter who is around.
A big part of anxiety is the fear of anxiety itself, and the constant running away from it or even dwelling on it.

Normalizing anxiety and the symptoms of anxiety, telling yourself its okay for you to feel that way, its okay for others to notice you're anxious, it's okay for your physical reactions to happen, not judging yourself or trying to hide it. Imagine having a panic attack and then saying to yourself "That's okay. I'm okay. No big deal. Everyone saw that, no big deal. I can get back to my day or whatever I was doing." and truly feeling that acceptance, instead of, for lack of a better word, sulking in it.

I think the allowance and acceptance of it will lessen the anxiety episodes over time.