We have gathered information from the MIUI Forum in China for the latest deployment of the Android Pie for each handset that are concerned. There are so many different information circulating on the internet, please disregard it as this is the official statement that came from MIUI China Forum from admin 蘑菇面包.
There is a recent article circulating the stop of updates for Redmi 6A, Redmi 6 and Redmi S2 for Android P, based on official statement they just stopped recruiting beta testers, it does not mean that they will stop releasing updates.
Please always refer to official sites of Xiaomi for the most accurate information.
Source: www.miui.com