I'm not sure you actually read what you linked.
Nobody makes the claim of genocide.
They do make the claim of "cultural genocide", (...)
In the topic Classification which was linked there's a section called Ethnocide or cultural genocide and one called Genocide or crimes against humanity. Did you seriously not even read the headlines of the topic he linked so that you only saw the first one or are you just being dishonest? By the way the actual genocide section is four times longer than the cultural genocide one. Here are some excerpts:
In June 2019, the China Tribunal, an independent judicial investigation into forced organ transplantation in China concluded that crimes against humanity had been committed beyond reasonable doubt against China's Uyghur Muslim and Falun Gong populations.
An August 2020 Quartz article reported that some scholars hesitate to label the human rights abuses in Xinjiang as a "full-blown genocide", preferring the term "cultural genocide", but that increasingly many experts were calling them "crimes against humanity" or "genocide". Also in August 2020 the spokesperson for Joe Biden’s presidential campaign described China's actions as genocide.
In October 2020, the U.S. Senate introduced a bipartisan resolution designating the human rights abuses perpetrated by the Chinese government against the Uyghur people and other ethnic minorities in Xinjiang as genocide. Around the same time, the House of Commons of Canada issued a statement that its Subcommittee on International Human Rights of the Standing Committee on Foreign Affairs and International Development was persuaded that the Chinese Communist Party's actions in Xinjiang constitute genocide as laid out in the Genocide Convention. The 2020 annual report by the Congressional-Executive Commission on China referred to the Chinese government's treatment of Uyghurs as "crimes against humanity and possibly genocide." In January 2021, U.S. secretary of state Mike Pompeo announced that the U.S. government would be officially designating the crimes against the Uyghurs and other Turkic and Muslim people living in China as a genocide.
In January 2021, the United States Holocaust Memorial Museum stated that, "[t]here is a reasonable basis to believe that the government of China is committing crimes against humanity."
According to a March 2021 report that was written by over 50 worldwide experts on China, genocide, and international law, the Chinese government breached every article in the Genocide Convention, writing that “simply put, China's long-established, publicly and repeatedly declared, specifically targeted, systematically implemented, and fully resourced policy and practice toward the Uyghur group is inseparable from 'the intent to destroy in whole or in part' the Uyghur group as such." The report, published by the Newlines Institute for Strategy and Policy, said there were credible reports of mass deaths under the mass internment drive, while Uighur leaders were selectively sentenced to death or sentenced to long-term imprisonment. “Uyghurs are suffering from systematic torture and cruel, inhumane, and degrading treatment, including rape, sexual abuse, and public humiliation, both inside and outside the camps,” the report stated. The report argued that these policies are directly orchestrated by the highest levels of state, including Xi and the top officials of the Chinese Communist Party in Xinjiang. It also reported that the Chinese government gave explicit orders to "eradicate tumours", "wipe them out completely", "destroy them root and branch", “round up everyone", and "show absolutely no mercy", in regards to Uyghurs, and that camp guards reportedly follow orders to uphold the system in place until ‘Kazakhs, Uyghurs, and other Muslim nationalities, would disappear...until all Muslim nationalities would be extinct’.
