Considering Fortnite and DBFZ are rumored from a more recent leak and the fact that NBA 2K19 (though its hard to say if there was concern for 2K19 coming at all), FIFA 19 (same as NBA 2K), and Pokemon Let's Go are confirmed for Switch just recently, I'm not sure if I would totally dismiss the paper leak. Granted, paper leaks usually are wrong and I'm not sure when Nintendo usually produces their pre-recorded presentations.
I'll keep an open mind for now.