No. It isn't metadata. Metadata will allow your asset pack to appear here https://itch.io/game-assets/assets-cc0
Viewing post in Pixel x16 Project version 1.4 comments
You need to open page of your asset pack (https://olteanugamestudio.itch.io/pixel-x16-project-version-02). In top of that you will see "Edit asset pack". You need to click it then you will need to to click step by step each of the following buttons "Metadata->Release Info->License for assets"... In the end you will need to select the license from the list
You can leave a comment here to support my proposal about making metadata visible for those who are interested in it https://itch.io/t/2919128/metadata-encouragement#post-7952450