Huis are han chinese of muslim faith. I have no issues with them for being patriotic to their country. But east turkistan is an occupied territory...
Its not just Hui. Salar Muslims in China are descended from Turkmen who migrated from central asia to Qinghai in China, and their clan leaders submitted as vassals to the Emperor of China. They mixed with Chinese and absorbed a large amount of Chinese influence, culture, loanwords, and use Chinese as their main literary language like you Pashtuns used Urdu or Persian. They still speak their own language related to Turkmen, and they do not have a seperatist movement. They share the same Chinese style Sufi or other Islamic sects with the Hui.
There were large amounts of Salar officers in the Chinese army, some of whom fought Uyghur seperatists, one of them, Han Youwen served as vice-chaiman in Xinjiang until he died in the 1990s. The Hui General Ma Bufang was heavily connected to the Salars and had many of them in his army.
There are Mongolian speaking Muslims called Dongxiang too, who previously served in large numbers in the Chinese army, they migrated from central asia and Mongolia into China,mthey mixed and married with Chinese, they are influenced by China in the same way as the Salar, Chinese loanwords, using Chinese as their main written language, following Chinese style sects. They do not have seperatist movement either.
They are patriotic to their country, the Salar are well off, and the Dongxiang may be poor but neither have seperatist goals.