Tweet Eater doesn't use your private data.
Tweet Eater simply interacts with the Twitter API on your behalf, to fetch a Tweet count and issue delete requests. It merely uses the account information on your device to delete tweets, nothing more.
Tweet Eater never transmits your information to a third party, nor posts tweets on your behalf.
I plan to open-source the codebase once I clean it up a bit. If you have any questions, don't hesitate to reach out to me on twitter: @cdstamper