Why is al-fatḥ not treated as an empty repetition of naṣr?

Supplementary Practice 22: Comparative Rhetorical Study of Sūrat al-Kāfirūn and al-Naṣr

• Help and attained victory are related but distinguishable meanings
• Al-fatḥ is not coordinated with naṣr
• The two words necessarily negate each other
• Al-fatḥ is an independent imperfect verb