The first article deals with a U.S. bill passed against organ harvesting, of which the passage of such a bill on its own is no more evidence of the PRC’s wrongdoing than if the PRC were to pass a law against U.S. wrongdoing. The article mostly touches on Enver Tohti’s testimony and others presented at the Uyghur Tribunal, a “people’s tribunal” requested by the World Uyghur Congress, an organization which partially funded the Uyghur Tribunal, and which is funded by the NED, a U.S. government agency which distributes funds allocated to it by Congress (i.e. the Tribunal was funded by the U.S. government through an intermediary).

The current president of the NED Carl Gershman stated in 1986, "We should not have to do this kind of work covertly. It would be terrible for democratic groups around the world to be seen as subsidized by the C.I.A. We saw that in the 60's, and that's why it has been discontinued. We have not had the capability of doing this, and that's why the endowment was created."

And Allen Weinstein (founder of the NED) said in 1991, "A lot of what we do today was done covertly 25 years ago by the CIA.”

The Tribunal itself had issues with the accurate handling of testimonies, with a relevant comment in an assessment reading: “Needless to say, the (unsworn) word of one individual is not sufficient to substantiate such a grave allegation, nor is it sufficient to extrapolate it out to the PRC government possessing special genocidal intent forming part of a manifest pattern of destruction directed at the Uyghur population. Reliance on such weak evidence may be a result of the Uyghur Tribunal failing to appoint a (competent) defense counsel for the PRC government.”

The article later cites the China Tribunal, initiated by ETAC, which has Falun Gong (homophobic feudalist cult) members on its committee. The Tribunal faces the same problems of cross examination and no proper opposition representation with the majority of its witnesses being Falun Gong members, and there also being the testimony of a WUC member (problems already discussed):

Fears were compounded during the so-called “People’s” China Tribunal” in 2019 when observers learned over the course of days of witness testimonies, first hand experiences and expert research, that organs were available on demand, that special fast track human organ lanes had been set aside at Xinjiang’s Kashgar airport, and that Uyghurs were being increasingly targeted.

The OCHR “extreme alarm” bit is nonsense, with the cited article containing no specifics at all, and the full OCHR report being (relatively) (poor).

The second source is the testimony of a doctor. Like the falsified testimony of infanticide in Iraq which partially urged the Iraq War, this is not enough to indict an entire nation, especially with this testimony being presented in front of a U.S. government committee, with testimony in this area proven to be falsified in other instances.
A wikipedia article with weak statistical precedent for accepting the word of a deranged racist cult.
Most of the sources are just the findings of the China Tribunal (already discussed)

We must protest the unjust and inhumane incarceration and oppression of Uyghurs and marginalized groups around the world.

The cited source in this excerpt is a Toronto Star article which cites the China Tribunal again of course, but also states that this is the largest incarceration of a minority group since the Holocaust, despite no evidence of this, with the origin of the million+ number being Adrian Zenz (Director at the Victims of Communism Memorial Foundation, which was established by the U.S. government), who in his initial report for this estimate [https://doi.org/10.1080/02634937.2018.1507997], cites RFA (U.S. government propaganda outlet) four times, and the estimate is only mentioned on (pp. 21-2). Zenz finds this number by roughly extrapolating a “leaked” report by Newsweek Japan (affiliated with Newsweek Inc.). This report comes from “Istekral TV”, which frequently platforms the terrorist organization ETIM. The report was never confirmed. Judging by an RFA report (RFA 2017; p. 22), Zenz states, “while there is no certainty, it is reasonable to speculate that the total number of detainees is between several hundred thousand and just over one million.” This is all that is said regarding this topic. Since then, Zenz as well as everyone else have converted the number (it is quite suitable to multiply it at one’s discretion) into pathology, so that its origins are quite obscured.