The source describes the special care given to preparing muṣḥafs in the time of ʿUthmān and treats their writing conventions as authoritative, hence ʿUthmānic rasm.
Modernizing the spelling of an ordinary word for convenience is not the same as preserving the inherited written form of Qurʾānic scripture. Recitation remains a matter of received pronunciation.
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ʿUthmānic muṣḥafs and written conventions
Conclusion: Tajwīd, Waqf, ʿUthmānic Rasm and Qirāʾāt
The source describes the special care given to preparing muṣḥafs in the time of ʿUthmān and treats their writing conventions as authoritative, hence ʿUthmānic rasm.
Modernizing the spelling of an ordinary word for convenience is not the same as preserving the inherited written form of Qurʾānic scripture. Recitation remains a matter of received pronunciation.