The author gives this Quranic passage as an example:
وَالَّذِينَ يُتَوَفَّوْنَ مِنكُمْ وَيَذَرُونَ أَزْوَاجًا وَصِيَّةً لِأَزْوَاجِهِم مَّتَاعًا إِلَى الْحَوْلِ غَيْرَ إِخْرَاجٍ
Meaning for this lesson: Those who die leaving wives were directed to make provision for their wives for a year without expelling them.
• The source describes the ruling discussed here as abrogated.
• The Arabic wording remains transmitted and preserved in the Mushaf.
• It therefore remains Quranic wording.
Notice the reasoning: the ruling status changed, but the wording's status as Quran did not.