The "Pre-Activated" label means the ISO includes scripts or files intended to bypass Windows activation, theoretically offering a fully licensed experience without a product key.
: Unlike earlier lite versions, this build includes the component store, allowing users to add features like Windows Media Player or different languages after installation. Tiny10 v2023.08 -Window 10 Lite- Pre-Activated ...
You can legally install the non-activated Tiny10 (available from the same source) and use a legitimate Windows 10 Pro license key if you have one. The "Pre-Activated" label means the ISO includes scripts