Regardless of whether it matches everyone's exact definition, it's clearly an atrocity.
1. https://www.smithsonianmag.com/history/is-china-committing-g...
UN representatives didn't characterize the situation as a genocide.
Following the 'forced sterilization' link from the article you linked brought me to this one: https://apnews.com/article/ap-top-news-international-news-we...
In there, they say frame it as an attack on minorities, but then they describe it as being applicable to people who already have 3 or more children. They just finished up a 1 child policy for the entire country and the Han majority are still reproducing below replacement levels.
There is plenty to disagree with about their policies, but it's not genocide.