Hopefully locations shared by users not part of my iCloud Family account, and "Items" (Apple jargon term for AirTags). Currently it only shows macOS or iOS "Devices" directly linked to my iCloud account, or in my iCloud Family, none of the locations shared by friends. And it shows no "Items," not even those in my iCloud account.
“Items” is not an Apple jargon term for AirTags. AirTags are not the only thing that can show up in this list. Third-party FindMy-compatible devices are quite common.
Since you frankly seem to have a bee in your bonnet about Apple, I’d suggest that you actually look into these. They might be more to your taste.
(... yep, it looks like one of their example programs is about accessing AirTag info via API: https://github.com/malmeloo/FindMy.py/blob/main/examples/rea... ...)