This is not referring to the divine revelation of Allah. Please read below:
وَ تَمَّتۡ کَلِمَتُ رَبِّکَ صِدۡقًا وَّ عَدۡلًا ؕ لَا مُبَدِّلَ لِکَلِمٰتِہٖ ۚ وَ ہُوَ السَّمِیۡعُ الۡعَلِیۡمُ
“The word of your Lord [about these people] has been fulfilled with truth and justice. No one can change His words. And He hears and knows all“.[182]
[182]. This refers to the statement of God which He made when Satan threatened that he will necessarily lead the progeny of Adam to polytheism and idolatry. God had said that if this happened, He would necessarily consign Satan and his followers to Hell. Imām Amīn Aḥsan Iṣlāḥī writes:
… This verdict conforms to the standards of both truth and justice. In other words, what God has said is not only true, it is also just. This is because God has conclusively communicated the truth to them. If, in spite of this, they insist on following the suggestions of Satan instead of following the guidance of God, they deserve the fate God has informed them of. The verdicts of God are subservient to the established practice set by Him. No one can change it. God hears and knows all. Neither are any of His actions based on a lack of knowledge nor is there any chance of a mistake or injustice in them. (Amīn Aḥsan Iṣlāḥī, Tadabbur-i Qur’ān, vol. 3, 146)
(Excerpt from Quranic Exegesis: Javed Ahmed Ghamidi)
(English Rendering by Dr. Shahzad Saleem)
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As for the changes in divine revelation are concerned, there are other Quranic verses which point to it. Please refer to the following detailed discussion on this topic:
Discussion 84976