Photos stored in original quality are counted towards your max, only photos in reduced quality taken with a Pixel device are grandfathered and do not count.
> Starting June 1, 2021, any new photos and videos you upload will count toward the free 15 GB of storage that comes with every Google Account or the additional storage you’ve purchased as a Google One member.
> Any photos or videos you’ve uploaded in High quality before June 1, 2021 will not count toward your 15GB of free storage. This means that photos and videos backed up before June 1, 2021 will still be considered free and exempt from the storage limit.
Maybe we understand the word differently, but to me that says that (existing) high-quality photos are indeed grandfathered (they will not suddenly start using your quota), just not new ones you upload after June.
