Reading through the article from CBC, I haven't really seen much reason to see that he actually endorses the material or mindset. Mostly seems like he's just an avid collector of historical memorabilia, especially keeping in mind other things he keeps.
When I did currency collecting, I used to have a Nazi-era German coin that I bought from the local antique mall. Didn't ascribe to the beliefs of the entity that minted the coin, didn't agree with the emblem that was pressed onto it, just thought it was neat having a little piece of history like that in my possession.
Besides, in high school I knew a few people that went out of their way to get Mein Kampf. Doesn't mean they agree with it, they were just people who were avid about political history like that. The same people also read The Communist Manifesto and other such books.
As someone who sees themselves as relatively progressive, I do think at times people take things a bit far, and this is one of those cases.