As of 2019, Perry has been telling the media that figure is now 300. She has mentioned in previous interviews that her count includes multiple chapters of the same umbrella group.
True North reached out to Perry and asked her for the document, report or source that lists these 300 active far-right extremist groups. “This is a number that is coming up in the context of our current research. We have not published on it yet as we still have some ways to go,” Perry replied.
FACT CHECK: Are there 300 active “far-right” hate groups in Canada? https://tnc.news/2020/11/18/fact-check-are-there-300-active-far-right-hate-groups-in-canada/
IIRC Cosmin Dzurdsza from True North took her to court over denied FOIA requests to reveal the list and lost.
Yes, basically academic institutions have huge leeway over what they can deny to release.