Yes, no contemporary portraits of Anne Boleyn survive.
However we do have contemporary accounts of aspects of her life such as Lancelot de Carle, a secretary to the French Ambassador who was a witness to her trial and execution.
What examples of what we do know about her life are misleading and incorrect?
Thats the point, much was destroyed, so how can I possibly know, or anyone for that matter? Its not complete, I hope you agree to this.
But the OP is how much is correct? Its impossible to know, and I assume the account you quote was from a catholic?