Canada

Here is a more substantial discussion about the whole thing. I've pulled some excerpts, but the original article has the citations and links

https://theconversation.com/we-fact-checked-residential-school-denialists-and-debunked-their-mass-grave-hoax-theory-213435

Commentators circulating allegations of a “hoax” contend journalists have misrepresented news of the potential unmarked graves, circulating sensational, attention-grabbing headlines and using the term “mass grave” to do so. They also contend some First Nations, activists or politicians used this language for political gain — to shock and guilt Canadians into caring about Indigenous Peoples and reconciliation.

Like the councillor in P.E.I., many people — in Canada and internationally, fuelled partly by misinformation from the far-right — are accepting and promoting the “mass grave hoax” narrative and casting doubt on the searches for missing children and unmarked burials being undertaken by First Nations across Canada.

What did Canadian news outlets actually report after the Tk’emlúps te Secwépemc First Nation made their public announcements about their search for missing children?

To find out, we analyzed 386 news articles across five Canadian media outlets (CBC, National Post, the Globe and Mail, Toronto Star and The Canadian Press) released between May 27 and Oct. 15, 2021.

What we found, according to our evidence from 2021, is that most mainstream media did not use the terminology “mass graves.” Therefore, we argue that the “mass grave hoax” needs to be understood as residential school denialism.

After some public confusion over the specific details of the May 2021 Tk’emlúps te Secwépemc First Nation announcement, which named “preliminary findings” regarding “the remains of 215 children,” the First Nation clarified the findings as the confirmation of “the likely presence of children, L’Estcwicwéý (the Missing) on the Kamloops Indian Residential School grounds” in “unmarked burials.”

The National Centre for Truth and Reconciliation had already identified 51 student deaths at the Kamloops school using church and state records.

Of the 386 articles reviewed in our study, the majority of the articles (65 per cent, or 251) accurately reported on stories related to the location of potential unmarked graves in Canada.

A minority (35 per cent or 135 articles), contained some inaccurate or misleading reporting; however, many of the detected inaccuracies are easily understood as mistakes and most were corrected over time as is common practice in breaking news within the journalism industry.

Of the 386 total articles, only 25 — just 6.5 per cent of total articles — referred to the findings as “mass graves,” with most of the articles appearing in a short window of time and some actually using the term correctly in the hypothetical sense (that mass graves may still be found).

That means that 93.5 per cent of the Canadian articles released in the spring, summer and fall of 2021 that we examined did not report the findings as being “mass graves.”

It appears that some journalists and commentators misunderstood a large number of potential or likely unmarked graves for mass graves in late May/June 2021. By September, denialists were misrepresenting the extent of media errors to push the conspiratorial “mass grave hoax” narrative online.

Our research shows that the “mass grave hoax” narrative hinges on a misrepresentation of how Canadian journalists reported on the identification of potential unmarked graves at former residential school sites in 2021. And we hope our report sparks a national conversation about how important language is when covering this issue.

Media needs to be precise with language and also acknowledge its errors (and avoid future ones), or clarify details in a way that feeds truth, empathy and more accurate reporting — not denialism, hate and conspiracy.

There is also this:

https://en.m.wikipedia.org/wiki/Kamloops_Indian_Residential_School

Preliminary findings announced in May 2021 by the Tk’emlúps te Secwépemc suggested that 215 graves could exist at the site. The National Centre for Truth and Reconciliation had officially documented 51 students who died at the school.[46] Their dates of death range from 1919 until 1971.[46] In July 2021, Beaulieu revised her estimate to 200 and noted that they should be considered "probable burials" or "targets of interest", and said that only with an excavation could they be confirmed as human remains.[6] Beaulieu also noted that the apple orchard she surveyed constituted only two acres of the 160-acre residential school site.