وَهُوَ غَيْرُ الْعِلْمِ
It is distinct from knowledge.
Knowledge concerns the disclosure of a reality; speech may involve reporting, commanding, or prohibiting. A person's making a statement does not establish that the person knows it to be true. A human can report falsely even while knowing the contrary.
This example demonstrates a conceptual distinction between knowledge and speech. It does not allow falsehood to be predicated of God; divine truthfulness and transcendence remain affirmed.