Since there is no Google logos, nor hosted by Google, neither the webpage or the repository itself (and Google "eats" all projects made by Googlers, even if done in their freetime), it's fair to reach the conclusion it's not a Google project. They're just using the font against the wishes of Google.
> Can I use the Product Sans or Google Sans fonts?
> No, Google owns these fonts and they are only available for use in Google products, by Google.
> Can I use the Product Sans or Google Sans fonts?
> No, Google owns these fonts and they are only available for use in Google products, by Google.
https://developers.google.com/fonts/faq#can_i_use_the_produc...