Besides delaying the game and amiibo, Bandai Namco Entertainment has confirmed that the Dark Souls Remastered Network Test for Nintendo Switch has been delayed as well.
The Network Test will now take place at a time closer to the Nintendo Switch release, scheduled to hit in Summer 2018. More details expected to follow in the future.
We will test the server performance of the Switch version apart from the others, and at a time closer to the Switch release. We will announce the dates when they are available.
— Dark Souls (@DarkSoulsGame) April 17, 2018