A drowsy tribe for Quran 13:31?

I need clarity and context on the following which is said by Ibn Abbas (RA): > “Ibn Abbas recited this verse as ‘أَفَلَمْ يتبين ٱلَّذِينَ’. He was > told that it is ‘أَفَلَمْ يَا۟يْـَٔسِ ٱلَّذِينَ’ to which Ibn Abbas > replied: “The writer has written يَا۟يْـَٔسِ but I think that he may > not have been wakeful at that time of writing this word.” > > Al Itqan fi Uloom al Quran, Volume 1 page 238 The same is said elsewhere: > وأخرج ابن جرير وابن الأنباري في المصاحف، عن ابن عباس – رضي الله عنهما > – أنه قرأ [أفلم يتبين الذين آمنوا] فقيل له: إنها في المصحف { أفلم ييأس > } فقال: أظن الكاتب كتبها وهو ناعس. > > Ibn Jarir and Ibn al-Anbari included in the musahif on the authority > of Ibn Abbas – may God be pleased with them – that he read {are those > who believe clearly aware} and it was said to him: It is in the > Qur’an: “do not those who believe despair.” So he said: I think the > writer wrote it while he was drowsy > > Tafsir Manthur Ibn Hajar said on it's chain: > وروى الطبري وعبد بن حميد بإسناد صحيح كلهم من رجال البخاري عن ابن عباس > أنه كان يقرؤها ‏”‏ أفلم يتبين”‏ ويقول‏:‏ كتبها الكاتب وهو ناعس > > And Tabari and Abd bin Hamid narrated with a Sahih chain containing > all the narrators from the rijal of Bukhari, from Ibn Abbas that he > recited “‏ أفلم يتبين‏” and said that the writer had written it > [يَا۟يْـَٔسِ] when he was drowsy. > > Fath al Bari, Volume 8 page 373 Was Ibn Abbas simply mistaken here?