This narration, if Ash-Shaafi‘i really said it, indicates the extent of how daring the fabricators were to invent such a huge amount of Tafseer that was attributed to Ibn ‘Abbaas.
The story, if told by Ash-Shaafi‘i, illustrates the boldness of the compilers in creating an extensive collection of Quranic interpretations that were mistakenly linked to Ibn ‘Abbaas.