No, what is going on in Tibet does not measure up to "ethnic genocide of Sudan" and Millions of Tibetans have not died.
As fucked up as China is, Tibet is a better place in many aspects then it was prior to China, for example workers in Tibet have the second highest wages in China, the life expectancy in Tibet in 1950 was 35 years, now it's 67, the GDP is thirty times that of before 1950, there is 22,500 km of highways, as opposed to none in 1950, now 25 scientific research institutes as opposed to none in 1950, infant mortality has dropped from 43% in 1950 to 0.661% in 2000. I mean, they can go back to the dark ages and be ruled by a oppressive religious hierarchy and worship 6 year olds if they want to. That's cool.