The suffix "-cide" means "kill." See also: "pesticide," "regicide," and "patricide." Reeducation camps are not mass killing camps. The Nazis committed genocide in the Oxford Languages definition.
The comment the GP comment was responding to was about genocide. I'm certain you didn't know that already, or you wouldn't have posted the parent comment.
It's pretty awful but does not seem to rise to the level of Nazi extermination camps as far as I can tell. Seeing it through the lens of the Nazi regime does not seem either illuminating or helpful to stop it.