"In each case, the critiques imply that inclusion of these voices in our is somehow an endorsement of them by News"
Ooft, a swing and a miss. When you platform a niche bad idea, you're spreading it and it finds more supporters. That goes for Alberta separatism, for sovereign citizens, and even for suicide! The media has long avoided reporting details of the latter, because it leads to copycats. Explicit endorsement isn't required to do damage!
https://www.cbc.ca/news/editorsblog/cbc-news-platforming-1.7580219