لأنه لو ثبت الحل بتركها عامداً ثبت الحل بتركها ناسياً
If permissibility were established for deliberate omission, it would also apply to forgetful omission.
The argument does not equate intentional conduct with forgetfulness. It shows that reading the report as a completely unrestricted permission would reduce the effect of the general Qurʾānic prohibition much more substantially.
Hanafi reasoning therefore treats the forgetful person differently from one who deliberately omits the formula. Specification of a general text, legal excuse, and the probative status of a solitary report remain distinct questions.