Aurora Store still works fine without the default enabled account sharing feature. Google hasn't blocked using Aurora Store as an alternate Play Store client but rather account sharing. By default, Aurora Store violates the Play Store terms of use by sharing accounts. That's what's being detected and blocked.

Aurora Store isn't one of the main recommendations from GrapheneOS for obtaining apps. It's mainly useful as a workaround for installing Play Store apps requiring the device or strong integrity level for their Play Store listing. It would be better to find another way to deal with this.