This is because thyroid gland has a true capsule and false capsule (pretracheal fascia). The false capsule is attached to thyroid cartillage, hence glands moves up with swallowing.
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The thyroid gland lies caudal to the thyroid cartilage...During normal deglutition, the gland moves cephalad, (which means toward the head or "up"). I would infer that this also means that the cartilage moves up during swallowing.
Hope this helps!