That policy is old. By definition, with unlocked Bootloader you don't pass Play Integrity and without Play Integrity Wallet (and RCS, etc) will not workThat is going to be bad news
However, there are methods to spoof. And that is what the XiaomiEUModule is used for.
For attesting Play Integrity, your phone pretends to ve something else
It was 'Moto Clark' with the last week XiaomiEUInjector - but the Clark is now 'banned" by Google
Just like they banned Griffin a week ago (Griffin was alive with the previous XiaomiEUModule since Feb 29 till May 15)