Possibly because the Quran is pointing to a verse that was revealed in the previous suhuf (that NO DOUBTS may be left for the people of the book and the believers). It is a question of yaqeen, and acceptance of obvious facts, and it separates people into mumin and kaafir -regardless of their previous partisan affiliations.
وَمَا جَعَلْنَآ أَصْحَٰبَ ٱلنَّارِ إِلَّا مَلَٰٓئِكَةًۙ وَمَا جَعَلْنَا عِدَّتَهُمْ إِلَّا فِتْنَةً لِّلَّذِينَ كَفَرُوا۟ لِيَسْتَيْقِنَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَٰبَ وَيَزْدَادَ ٱلَّذِينَ ءَامَنُوٓا۟ إِيمَٰنًاۙ وَلَا يَرْتَابَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَٰبَ وَٱلْمُؤْمِنُونَۙ وَلِيَقُولَ ٱلَّذِينَ فِى قُلُوبِهِم مَّرَضٌ وَٱلْكَٰفِرُونَ مَاذَآ أَرَادَ ٱللَّهُ بِهَٰذَا مَثَلًاۚ كَذَٰلِكَ يُضِلُّ ٱللَّهُ مَن يَشَآءُ وَيَهْدِى مَن يَشَآءُۚ وَمَا يَعْلَمُ جُنُودَ رَبِّكَ إِلَّا هُوَۚ وَمَا هِىَ إِلَّا ذِكْرَىٰ لِلْبَشَرِ
English - Sahih International
And We have not made the keepers of the Fire except angels. And We have not made their number except as a trial for those who disbelieve – that those who were given the Scripture will be convinced and those who have believed will increase in faith and those who were given the Scripture and the believers will not doubt and that those in whose hearts is disease [i.e., hypocrisy] and the disbelievers will say, "What does Allah intend by this as an example?" Thus does Allah send astray whom He wills and guide whom He wills. And none knows the soldiers of your Lord except Him. And it [i.e., mention of the Fire] is not but a reminder to humanity.
English - Yusuf Ali
And We have set none but angels as Guardians of the Fire;
and We have fixed their number only as a trial for Unbelievers,
- in order that the People of the Book may arrive at certainty,
and the Believers may increase in Faith,
- and that no doubts may be left for the People of the Book and the Believers,
and that those in whose hearts is a disease and the Unbelievers may say, "What symbol doth Allah intend by this?"
Thus doth Allah leave to stray whom He pleaseth, and guide whom He pleaseth:
and none can know the forces of thy Lord, except He and this is no other than a warning to mankind.
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The number mentioned directly above the verse is a number - above which is 19,
The final verse of chapter thirteen of the book of revelation is verse 18
This verse contains a number.
Please don't say that it is is "nothing but the word of a mortal" or "magic derived FROM OF OLD" without considering and evaluating what is being said.
Because it is to the people of this age that the warnings and messages are being concentrated.
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Chapter 18 of the book of revelation gives some clear and stark warnings, possibly about the very rich fake paradise of dajjal where almost every worldly person lacking yaqeen wants to go and stay for eternity. It also mentions a list of items that the usurer funded East India company unlawfully looted and sold.
Ought not the banking capital take notice?
Research and ponder.