لأن الرضا بالكفر كفر؛ لأننا نقول: الكفر مقضي لا قضاء
The text states that approval of disbelief as disbelief is itself disbelief, and replies that disbelief is decreed, not decree itself.
In this classical theological argument, acceptance of God's decree and approval of disbelief as a religious position are different acts. The former concerns acceptance of divine wisdom and sovereignty; the latter evaluates a false belief as desirable or true.
Not excluding a sinful event from divine knowledge does not legalize the sin. Equally, condemning the sin does not deny divine decree. The technical distinction should not be turned into an unqualified judgment about individual persons without the required legal and doctrinal context.