When an act associated with divine power is ascribed to Jesus, two questions remain distinct: who possesses the ultimate power and through whom the act is manifested.
A miracle performed through a prophet may authenticate prophetic mission without making the prophet the Creator. In Qur’anic discourse prophets are God’s servants and messengers, and extraordinary events occur by divine permission.
For example, saying that a messenger healed someone with God’s permission attributes an act to the messenger in one sense while reserving independent power to God. Conflating these levels of attribution is the logical error addressed by the argument.