Wa Salaam,
I dont have detailed information on his biography, but Shaykh al Buni was a scholar and wali that lived many many years ago. And he was not Tijani. The book that Sidi Cerno was quoting from was a book Shaykh al Buni wrote with a lot of secrets and hidden knowledge.
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It's a high maqam to be humble and open minded about Allah's servants. It is better to see someone as a wali and in reality they are a hypocrite, rather than see someone as a hyprocrite but in reality they are a wali of Allah.-Shaykh Hasan Cisse