تِلَاوَتَهَا وَكِتَابَتَهَا
Their recitation and writing as well.
Supersession in recitation and writing concerns the earlier scriptures' former role as independent devotional and legislative standards for the later Muslim community. It does not assert that every physical copy or every word of an earlier text literally ceased to exist.
Reading a historical text, preserving it for research, and treating it as the governing basis of one's worship and law are distinct activities. In the final sense, the authoritative standard is the Qur'an and the Prophet's guidance.