Even if somebody comes up with a 'Tafseer' and associates it to some companion of The Prophet(S), by what criterion would you judge its authenticity?
The Quran is the only book we can trust as being completely true, and according to Quran itself, we do not need any other 'tool' to understand it.
54:17 And indeed, We have made the Qur’an easy to understand. Then, is there any who will learn?
May Allah Bless and Guide us to the truth.