The source then introduces tawkīd al-musnad ilayh, emphasis of the subject, as a distinct topic. The speaker may repeat or reinforce the subject expression so that its import is firmly fixed in the hearer's mind.
وَأَمَّا تَوْكِيدُهُ أَيْ تَوْكِيدُ الْمُسْنَدِ إِلَيْهِ فَلِلتَّقْرِيرِ
As for emphasizing the subject, it is for establishing and reinforcing it.
Here taqrīr does not mean making a public speech; it means securing the intended sense and reference in the listener's understanding.