قَالَ طَالِبٌ: أَكُلُّ رَأْيٍ قَدِيمٍ صَوَابٌ؟
A student asked: “Is every old opinion correct?”
The quantifier “kull” scopes over old opinions. A single counterexample is enough to defeat the universal claim. That differs sharply from concluding that all old opinions are mistaken.
The wording is interrogative, and the speaker may genuinely be seeking knowledge. Hamza by itself does not force an interpretation as rhetorical denial.