Switch needs an enormously strong fiscal Q3 to come anywhere even close to Nintendo's bold forecast. This isn't exactly the best way to start that, particularly since these October numbers include the Smash Ultimate bundle. Being down YoY when last year was hindered by stock shortages for the Switch isn't something that should be made light of.
I wasn't sure if the Smash Bundle would do very well or not, but I guess this confirms it. Bundling with a Digital Code that you can't use for over a month isn't going to pull many people in I guess. It was an odd decision. It'll probably do a lot better once Smash is ACTUALLY out.
Predictions (Made July 2019)
LTD: PS4 - 130m, Switch - 110m, XBO - 52m 2019 : PS4 - 15m, Switch - 18.8m, XBO - 4.8m 2020: Switch - 22m (Peak Year)