Is it true that using the automatic swinging yao lan (sarong) can cause damage to the baby brain due to constant swinging motion?

sleeping in yaolan can helps in making the head shape rounder and nicer, and they will have a sense of secure of being hug from the shape where they were put in. sometimes when they are slightly awake they move and it will auto rock and LO will fall back to sleep again without me attending to him at nighttimes