وَكَانَ الْأَوْلَى أَنْ يَقُولَ: لَيْسَ مِنْ أَسْبَابِ الْعِلْمِ بِالشَّيْءِ
It would have been preferable to say: “It is not among the means of knowing a thing.”
The qualification “correctness” prompts a subtle objection. A discussion of means of knowledge is broader than verifying the truth or falsity of a claim already under consideration; it also concerns knowing objects, their properties, and other states of affairs. Thus knowledge of a thing appears to be the more comprehensive expression.
This improvement in wording does not by itself mean that a person's inspired understanding can never be correct. The breadth of a definition and the public authority of an alleged means are separate questions.