«حكمه: يوجب علم اليقين كالعيان علماً ضرورياً، ويكون رده كفراً»
Its ruling: it yields immediate certain knowledge like direct observation; the book describes denial of this established degree of tawatur as disbelief.
Necessary knowledge here means certainty not dependent on reconstructing a fresh chain of argument each time. The author likens it to the certainty of direct sensory perception.
This is a doctrinal classification of evidence, not a license to declare a particular person an unbeliever. Applying such a judgment to any individual requires separate legal and theological conditions.