Are you hanging your entire argument on the word “lifetime”?
From their announcement
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. Your Google Account storage is shared across Drive, Gmail and Photos. This change also allows us to keep pace with the growing demand for storage. And, as always, we uphold our commitment to not use information in Google Photos for advertising purposes. We know this is a big shift and may come as a surprise, so we wanted to let you know well in advance and give you resources to make this easier.
From this you can infer photos prior to June 21 2021 did not count against the storage. And now they do. Making the product worse for users.