Canada is embroiled in a political issue with China right now. They're holding a Huawei exec named Meng Wanzhou at the request of the US, who are investigating Huawei for violating sanctions against China[1].
China retaliated by arresting two Canadians without apparent cause[2]. They're been in jail for two years.
The Conservative party put forth this motion for a vote as a move to put Trudeau's Liberal government in an awkward place: they would either condemn China's treatment of the Uighurs and make the Michaels/Meng Wanzhou situation more painful, or they wouldn't and would appear to condone genocide.
FWIW I suspect Trudeau and the Liberal party do believe Uighur treatment to be genocide (I do). But stating it publicly would make life even more difficult for them.
1- https://www.bbc.com/news/business-46462858
2- https://www.ctvnews.ca/canada/two-michaels-mark-two-jailed-y...