I can certainly confirm this for everyone - it is true if your build date is after 1st Jan 2023, it will come with the upgraded suspension. The confirmation is from Tesla official Weibo account.
This is awesome for my upgraded 20 inches rims...However, someone tested it by said it did not make much different....see image 3
For about two months now, Model Y units produced at Giga Shanghai have been fitted with an upgraded suspension system.
www.teslarati.com
The Model Y SUVs produced by Giga Shanghai since January 1 are equipped with an updated suspension system for improved comfort.
cnevpost.com
In sum, (1) To optimize the compression damping of shock absorber, low speed is not bumpy, high speed is more stable; (2) The stiffness of the top support of the shock absorber is improved by 50%, and the impact of the filter road is more in place; (3) The spring stiffness is reduced by 2-5N/mm, the vibration frequency of the suspension is adjusted, and the resonance frequency of the human body is far away to avoid motion sickness.