They did have their culture/religion repressed; not in totality but many practices are disallowed or only conditionally allowed. Many innocents are compelled to attend re-education centers that may in some cases restrict certain religious practices.

It's bad, in the way stop-and-frisk, racial profiling, or ten commandments schools are bad; it's not Auschwitz, in fact the camps and prisons the US sends people to are far closer to that level of depravity. The bickering you often see online about whether it's "genocide" is sometimes from a bad faith bombastic comparison to Nazi Germany usually rooted in misinformation (Thai BDSM clubs were once photographed and claimed to be "Uighur torture facility"; another photo of a bunch of Uighurs sitting in chairs had the chairs cropped out to make it look like they were forced to sit on the ground, just a couple examples), but other times it's based on the argument that what is being done functionally constitutes a cultural genocide which I personally think is worthy of discussion.