To the best of my knowledge, AirTag locations still cannot be obtained through the iCloud website. The locations it shows are simply generated by the devices themselves and uploaded directly to Apple. This library specifically only queries the FindMy network, which is the system that allows other iPhones (and iPads etc.) to "find" your devices.
The library also explicitly does not integrate with your Apple account, but only uses it to query encrypted location reports from Apple. This can be done with any account, even if it does not "own" the device, as long as you can generate the correct keys.
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.
