Nano price today have nothing with change the name / rebranding, but with
BTC price which is pull down all altcoins. Last time Nano price was 16+$ is around March 2 this year, but ETH was also around 800$ in May this year and now is 90$. Take some time and study charts on coinmarketcap, maybe some things will be clearer for you.
If
BTC price is fall even lower then Nano will follow that as other altcoins, there is no any mysteries in that.