الْقِسْمُ مِنَ النِّفَاقِ هُوَ نِفَاقُ الْأَعْمَالِ وَالْأَخْلَاقِ
This kind is hypocrisy in actions and character.
The discussion culminates in a distinction between concealed repudiation of belief, which is inaccessible without knowledge of the heart, and hypocritical traits in actions and character, which may be observable in society and require ethical correction.
Behavioral hypocrisy can be a serious moral defect. That does not mean an individual displaying one such fault has thereby been shown to inwardly reject the religion. Moral weaknesses occur in degrees; guidance and warning are meaningful precisely because behavior can be reformed.
Thus criticizing an observable trait is one kind of judgment; claiming to know concealed faith or disbelief is another and requires different grounds.