You have bolded the wrong part:
Secret Identity: At 3rd level, a mysterious avenger's force of personality and dedication to her cause give her the ability to keep her true identity secret, even from magical prying. She gains a +4 bonus on Disguise checks in a single disguise of her choice, typically her avenger persona. Once this disguise has been chosen, it can't be changed. She also gains a +4 bonus on saving throws against divination effect. At 11th level, she becomes immune to all scrying effects and other magical effects used in attempts to uncover her secret identity.
A blanket +4 save against divinations isn't bad, and the 11th level ability is even better, as most divination effects count as an attempt to discover the secret identity.