He is saying that Potassium Iodide (KI) supplies ALL of the body requirements for both Iodine and iodide.
This is different from what the Iodine doctors say. Iodine doctors say that both iodine AND Iodide are required. This is the entire reason for Lugols & Iodoral, in order to supply both iodine & Iodide in the correct ratio.