The wikipedia article says thousands of students did die at these schools and are buried in unmarked graves.
There have been bodies found at some sites, but there’s a site where the native population claimed there was a mass grave and no bodies have been found yet.
The Catholic church ran a massive ad campaign about this one site to try to push the narrative that no bodies has been found anywhere.
As of April 2025, no bodies have been exhumed from the suspected gravesites, largely due to a lack of community consensus on whether to investigate detected anomalies at the risk of disturbing burials.
Disputes regarding the conclusiveness of the evidence has helped spawn a movement of denialism about the existence of some or all residential school burial sites.
OP got brain worms