أَمَّا الْمَعْرِفَةُ: as for definiteness.
فَلَا يُعْتَبَرُ: it is not counted as relevant.
فِي مَنْعِ الصَّرْفِ: in the question of diptote status.
إِلَّا الْعَلَمِيَّةُ: except proper-name status.
The exception introduced by إِلَّا excludes definiteness by itself as a cause; the relevant cause is the status of being a proper name.
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Definiteness and Proper-Name Status in Diptote Rules
أَمَّا الْمَعْرِفَةُ: as for definiteness.
فَلَا يُعْتَبَرُ: it is not counted as relevant.
فِي مَنْعِ الصَّرْفِ: in the question of diptote status.
إِلَّا الْعَلَمِيَّةُ: except proper-name status.
The exception introduced by إِلَّا excludes definiteness by itself as a cause; the relevant cause is the status of being a proper name.