Copying @bilb@lem.monster 's comment

I don’t think that’s correct. There’s a vetting process (so it cannot be “any mod”), and it can’t be an existing free mod.

Creations must be standalone, so it cannot depend on other community releases, free or paid. Creations must be all-new to qualify for release. You cannot re-purpose older releases – or work by other authors, unless contracted. Creations cannot contain anything produced through generative AI.

https://creations.bethesda.net/en/creators/bethesdagamestudios