iOS Safari/WebKit current state of PWA persistence as of version 15.2

Question

I am reevaluating PWA feasibility for mostly offline based, occasionally used applications. So far I had experience that PWAs on iOS does not have permanent storage as the website allocated space is often subject to cleanup either due to lack of space on a device or after N (I guess 7) days of application/website inactivity. I am aiming for fully installed PWA's (homepage).

According to mozilla docs Safari should from version 15.2 fully implement the StorageManager persist API. On the other hand I have not found such a statement in Safari release notes.

Can someone confirm or disconfirm the persistence of PWA's on iOS?

Without full persistence occasionally used offline ready PWA applications on iOS are no go zone. The only remaining alternative remains cordova or capacitor then. Or other more exotic solutions then (like React Native).

Thanks.