Is the predecessor of Hui people in Ningxia today 1 1 the Tangut of Xixia in the century?

No, during the Mongol Empire, Mongolia destroyed Xixia and Jin, most of the Tangut was destroyed by Mongolia, and a few fled to the Southern Song Dynasty with the Han people in the Central Plains.

The ancestors of Hui people in Ningxia were Semu people in Yuan Dynasty. Because the Yuan Dynasty needed Semu people to do business with Mongols, it moved from Persia in Central Asia to Ningxia. In other places, most Hui people have merged with other nationalities who believe in Islam, and most Hui people have been transformed by Han Hui people. The Hui people in Hainan were joined by the adherents of Zhanpo, who changed their surnames to Islam.