Peace be upon those who follow the guidance. There is a famous tafsir of Quran which was written by somebody who adhered to the mu'tazila sect, nevertheless his tafsir is studied because of the work's quality while the deviant beliefs of the author are disregarded and ignored. Nothing curious, as long as a book provides accurate information of Islam and doesn't propagate deviant beliefs there should be no harm in reading it. Maybe some of the students of knowledge could remember the name of the author as I don't remember anymore.