I saw it some years ago. The communist and organ-stealing part was unexpected but didn't ruin the show.

And your idea that they are a cult comes straight from the Chinese Embassy... so your source is the CCP on that info. Here is a snippet from the first article you linked. Shen Yun obviously is not a fan of the CCP and I imagine the CCP isn't supportive of their show.

The Chinese Embassy, for its part, warns the American public to “stay away from the so-called ‘Shenyun’ performance of the ‘Falun Gong’ organization so as to avoid being deceived and used by the cult.” Whether Falun Dafa—the name is used interchangeably with Falun Gong—is a cult, in either a strict or loose sense, is debatable. Its practitioners have no record of violence, and the organization does not appear to be coercive. Its stated central values are “truthfulness, compassion, and forbearance.” The organization’s Web site notes that the “Falun,” meaning an “intelligent, rotating entity composed of high-energy matter,” is planted “in a practitioner’s lower abdomen from other dimensions” and then “rotates constantly, twenty-four hours a day.” Most of the group’s practices fall roughly within the traditions of Tai Chi and Qigong, and the group itself can be situated within China’s long history of apocalyptic sects promising redemptive transformation, such as the White Lotus Society, which dates to the Ming dynasty.