China is slowly erasing Tibet's name

Renaming the place you've colonized is a standard settler-colonialist step in the erasure of the indigenous population. Just China being China.

The government of China are not good people... is that controversial?

It's remarkable that Tibetan culture has been so tenacious that there's anything left of it today. If the government of 50 years ago had been able to exert the kind of control over its people that they do today, it's hard to imagine that it wouldn't have been fully eradicated by now.

Tibet is the romanized name for the region (based on Latin Tibetum). Tibetans call the Tibetan plateau "Bö" and Central Tibet "Ü-Tsang."

The original Tibetan Empire (circa 600-800 or something) stretched across the regions of Amdo (modern-day Qinghai), Ü-Tsang (modern-day Tibet Autonomous Region), and Khan (split between TAR and Sichuan). Xizang is a more or less direct transliteration of Ü-Tsang, the territory that makes up the vast majority of the modern-day TAR.

Tibet refers to the entire plateau (also referred to as the Qinghai-Xizang plateau or the Himalayan Plateau) and Xizang refers to the territory made up by the TAR. Xizang has, for as long as I can remember, been the Chinese name for the TAR.

This is manufactured outrage with a clickbait title... About what can be expected from Newsweek.

Edit: for some additional context, China is usually pretty good about keeping local names. See: Ürümqi (Wulumuqi) from the name of Dzungar village there, Kashgar (Kashigaer/Kashi) which has had the same name for millennia and Harbin (Haerbin) from the name of the Manchu village there (among others). Understandably, because Hui and Uyghurs still live in Urumqi and Kashgar, Manchu still live in Harbin, and Tibetans still live in Xizang.