The second group is described as “dakhala fī al-Islām maʿa ḍaʿfin fīhi”—they entered Islam while weakness remained in their religious commitment. This introduces a distinction between belonging to Islam and having a fully developed degree of conviction and practice.
A person may require knowledge, struggle, ethical training and time before religious behavior becomes steady. Attachment to wealth, fear, social pressure and heedlessness may weaken decisions. Such defects warrant moral attention but do not automatically prove concealed rejection of the faith.
The governing distinction is that a claim about outright inward unbelief differs from identifying a hypocritical characteristic in behavior. Shared terminology does not remove the difference in what these two judgments assert.