«إِلَّا أَنَّ هَذَا يَخْتَصُّ بِمَا لَمْ يَنْتَقِدْهُ أَحَدٌ مِنَ الْحُفَّاظِ مِمَّا فِي الْكِتَابَيْنِ»
This particular argument is restricted to narrations in the two books that have not been subjected to criticism by the recognized leading hadith masters.
The huffaz here are specialists with advanced command of narrations, narrator criticism, transmission routes, and hidden defects. Their criticism is technical and should not be confused with mere personal doubt or dislike.
When such an objection exists, it requires analysis. Inclusion in a Sahih does not, by itself, settle the specialized claim under discussion; conversely, the mere existence of an objection does not automatically establish a narration’s weakness.