That makes no sense. Why would there be no games releasing around Golden Week? Seems like the perfect time to release a game to capitalize on people having a bit of extra money to spend.
They all release before Goldenweek, like the sales for the holiday season happen before Christmas in western regions. Hence why they release so many games in April, but almost nothing in May anymore.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454