Can a blockchain keep a secret?

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I saw a thread that mentioned this paper Can a Public Blockchain Keep a Secret?. The people involved in the thread seem to dispute the validity of this work. I know some of the authors are from algorand that’s why i bring it up. The thread https://twitter.com/DavidVorick/status/1560867234519650305?s=20&t=0zZcexwYj0axRD4OOH2nww