Well, obviously they are breaking the street date. That's absolutely common. I order most of my games from an online shop that sends out copies as soon as they get them in. They usually get their copies two to three days before the official release date, because the Austrian partner of NIntendo doesn't ship them earlier.
The question really is why does Nintendo's Swiss partner send out the copies a whole week in advance to retailers.
They get a cut of the extortionate prices.
Don't Play Stationary 4 ever. Switch!