Sensitive information in a tree... but not in a branch. Fixable?

Back when I first started a project, I committed some sensitive information. I deleted it remotely and locally at the time.

But I was just notified it still exists after making the repo public. But the link I was given goes to a tree. And this is new to me. 

I can see the file but because it’s not part of a branch, I can’t delete it.

How can I fix this? 

Thanks for the help!

Hi @danboyle8637,

Thanks for being here! You’ve taken the correct steps in removing the information, next please contact private support to request that we remove all cached views and references to this data. If you haven’t already, please contact us at https://github.com/contact with the info so we can look into that further.