Honestly I was kind of surprised people were believing this applied to fan games... Nintendo has always had a very... very strict and firm stance on this. From a legal standpoint, it makes 0 sense to allow derivative works of their IPs to be distributed freely. There was a huge surge of posts on my facebook feed about it and it's just... Ugh... I get that hopes tend to skew reality but disconnecting from the excitement and looking at this rationally it wouldn't make sense. Also there's still no credible sources even on the video stuff, but as far as I can tell it's just an "ok" for people to publish gameplay videos on Nico Nico and draw fan art. Even if there were mention of fan games, there's a low chance it would even affect the west given their stance on emulation and fan games.
I mean the most logical way to break it down is that if Nintendo condoned making fan games using existing assets, they'd condone emulation. They don't. At all. It would make 0 sense for this to cover fan games.