Not to mention the fact that a philosophy course about Borges will likely be examining the work of the philosophers Borges was referencing. I've yet to see anyone make the claim that Borges originated any of the important philosophical ideas in his stories.
Edit: Just to back this up a little more, here is a quote from the man himself: "But I wonder if they are my ideas. Because really I am not a thinker. I have used the philosophers’ ideas for my own private literary purposes, but I don’t think that I’m a thinker. I suppose that my thinking has been done for me by Berkeley, by Hume, by Schopenhauer, by Mauthner perhaps."