There is no evidence of this. Please cite a source that is not Adrian Zenz
If you think Adrian Zenz is some kind of fraud there's nothing I can post that will convince you so sources are pointless. Google "China re-education camps" and you'll find hundreds of articles on the subject from news organizations all of the world
With zero sympathy for Chinese ethnic cleansing, Nazi concentration camps were perhaps a different league. Maybe people never even got to stay there: unloaded at the rail terminal, ushered into gas chambers, then burned in the crematoria.