How authenthic is "Usulal Qiraat" or "shatibiyyah " by Imam Shatibi

Recently online I encountered this book, people quote this specific passage: 25. "Now, the holder of the noble secret concerning sweet scents, he is Nāfi˘ who chose Medinah as (his) abode ": "Some have mentioned this esteemed secret concerning the sweet smell; when Nāfi˘ recited Qur`ān, the sweet smell of musk emanated from his mouth. When he was asked concerning it he replied that he saw the Prophet in a dream. He read to the Prophet, who blew into his mouth. Since that time this sweet aroma started coming from his mouth", I know Imam Shatibi (ra) is a respected scholar, but Has anyone ever encountered this work, can it be trusted?