مَا كَانُوا يَسْتَطِيعُونَ السَّمْعَ وَمَا كَانُوا يُبْصِرُونَ
They were unable to hear and did not see. (Hūd 11:20)
Negation of ability does not always describe the same kind of incapacity. Possession of ears, eyes or other physical means is one matter; using those faculties to accept truth through divine enabling is another.
The presence of the means must therefore be distinguished from the actual occurrence of the required response.