Currently available on the S21 series This is a new hardware and software solution which shields sensitive data from Physical attacks and securely isolates and protects Data from unauthorised access. Will come to other Devices in the future but does not seem to be specific list at the moment. see more here https://hitechglitz.com/samsung-announces-new-samsung-knox-vault-security-protocol-for-s21-series/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GBOne Ui 4.0,Android 12 Official Version.