إِنَّ هَذَا التَّقْرِيرَ ـ وَاللَّهُ يَعْلَمُ السَّرَائِرَ ـ يَذْكُرُ مَا ثَبَتَ مِنَ الْفَحْصِ.
This report—while God knows what is hidden—records what the inspection established.
The principal construction is inna hādhā al-taqrīra yadhkuru mā thabata min al-faḥṣ. “Hādhā al-taqrīra” is the subject of inna, and the following verbal clause serves as its predicate. The inserted clause is not a required component of that predication; it is iʿtirāḍ, recalling the limits of human knowledge about hidden intentions.
A practical test is whether removing the inserted clause leaves the main grammatical structure intact and whether the insertion contributes a relevant rhetorical purpose.