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Are we absolutely sure they don't just mean the localstorage containers that aren't part of the current domain? In the same way they are clearing cookies from a different domain, and not the ones that belong to the current domain.

EDIT: Clarification from a Webkit dev https://twitter.com/alexcroox/status/1242559843354972161

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Yeah, if you look at the section in question, they're talking about this: "However, as many anticipated, third-party scripts moved to other means of first-party storage such as LocalStorage."

Basically, the ad tech/tracker folks were using first-party site storage to store identifiers, which is what Apple's trying to protect against.

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