About the hadith of Jibril a.s. putting mud into the mouth of Firaun

So, I recently remembered the incident in the story of Musa a.s. where Firaun was drowing and tried to say the shahada, but Jibril a.s. shoved mud into his mouth out of fear that Allah would grant him mercy, as mentioned in [Tirmidhi](https://sunnah.com/tirmidhi:3107) . >حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا الْحَجَّاجُ بْنُ مِنْهَالٍ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ عَلِيِّ بْنِ زَيْدٍ، عَنْ يُوسُفَ بْنِ مِهْرَانَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏ "‏ لَمَّا أَغْرَقَ اللَّهُ فِرْعَوْنَ قَالَ آمَنْتُ أَنَّهُ لاَ إِلَهَ إِلاَّ الَّذِي آمَنَتْ بِهِ بَنُو إِسْرَائِيلَ فَقَالَ جِبْرِيلُ يَا مُحَمَّدُ فَلَوْ رَأَيْتَنِي وَأَنَا آخُذُ مِنْ حَالِ الْبَحْرِ فَأَدُسُّهُ فِي فِيهِ مَخَافَةَ أَنْ تُدْرِكَهُ الرَّحْمَةُ ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ ‏.‏
*Narrated Ibn 'Abbas: that the Messenger of Allah (ﷺ) said: "When Allah drowned Fir'awn he said: 'I believe that there is no god except the One that the children of Isra'il believe in.' So Jibrail said: 'O Muhammad! If you could only have seen me, **while I was taking (the mud) from the sea, and filling his mouth out of fear that the mercy would reach him.**'"* But [the verses](https://quran.com/yunus/90-91) in surah Yunus say that Firaun asked to be forgiven and Allah rejected him anyway > ۞ وَجَـٰوَزْنَا بِبَنِىٓ إِسْرَٰٓءِيلَ ٱلْبَحْرَ فَأَتْبَعَهُمْ فِرْعَوْنُ وَجُنُودُهُۥ بَغْيًۭا وَعَدْوًا ۖ حَتَّىٰٓ إِذَآ أَدْرَكَهُ ٱلْغَرَقُ قَالَ ءَامَنتُ أَنَّهُۥ لَآ إِلَـٰهَ إِلَّا ٱلَّذِىٓ ءَامَنَتْ بِهِۦ بَنُوٓا۟ إِسْرَٰٓءِيلَ وَأَنَا۠ مِنَ ٱلْمُسْلِمِينَ ٩٠ *We brought the Children of Israel across the sea. Then Pharaoh and his soldiers pursued them unjustly and oppressively. But as Pharaoh was drowning, **he cried out, “I believe that there is no god except that in whom the Children of Israel believe, and I am ˹now˺ one of those who submit.**” — 10:90* > ءَآلْـَٔـٰنَ وَقَدْ عَصَيْتَ قَبْلُ وَكُنتَ مِنَ ٱلْمُفْسِدِينَ ٩١ *˹He was told,˺ “**Now ˹you believe˺? But you always disobeyed and were one of the corruptors**. — 10:91* Why would Jibril a.s. fear about Allah forgiving Firaun, if Allah wasn’t going to forgive Firaun anyways?