Why does “God does not wrong people at all” illustrate muḥkam?

Degrees of Indication: Ẓāhir, Naṣṣ, Mufassar, Muḥkam and Obscure Expressions

• It is a temporary transactional license
• It makes no meaningful assertion
• It affirms an established truth not subject to abrogation
• It is a change in juristic custom