They were just lucky or Freiburg were in their poor form earlier this season, if you take a closer look at the statistics then you will understand that Stuttgart win isn't a win that stems from their great game. They don't dominate from any side, let's say one of the sides they control.
Ball possession? No, they even only have 48% there.
Attempt shot? Of course not, Freiburg played more dominantly in attack, which is why I say that Stuttgart was just lucky.
It's a surprise in football and things like this can happen.
Looking at the statistics I think it is quite comparable but indeed the condition of the Freiburg defense is quite different in this match, especially after Freiburg conceded 2 goals, they went all out in attack, which in fact for the 3-5 goal it happened because of Freiburg's own mistakes because they left their defense line too empty and fast counterattacks through direct passes were all successfully maximized into goals by the players from Stuttgart.
But indeed for Stuttgart's quick counter-attacks this must be thumbs up in this match because they really played very well even though this is a surprise and very rarely things like this happen but they need to celebrate this victory.
Maybe they thought they were able to suppress Stuttgart after changing their playing style, but in reality they made a fatal mistake. They (Stuttgart) are having a good start in this season, even in their next 3 matches they're still facing teams they are most likely to beat like Mainz, Darmstadt and Koln. If they manage to get full points from those 3 matches they will collect 15 points. But is that possible? what do you think?