Here are a few articles which support the petition.

Windsor Star Feb. 28, 2023--Activist Harding-Davis launches petition calling on feds to apologize for slavery
https://windsorstar.com/news/local-news/local-black-activist-harding-davis

CBC News Windsor Aug. 2, 2022--Black leaders want Canada to apologize for its history of slavery;
Black leaders are renewing calls for Ottawa to make a formal apology for the country's history of slavery
https://www.cbc.ca/news/canada/windsor/a-specific-form-of-anti-black-racism-scholars-want-canadian-apology-for-slavery-1.6538399