I don't know whether this defeat was intentional or not because in my opinion Real Sociedad's performance was stronger to win if seen in terms of quality and statistics, but indeed football can sometimes provide surprises that we can't expect because after all Villarreal deserved the three points because their success in applying pressure like real sociedad at the anoeta stadium.
The visitors' landslide victory was indeed very good in this match, even Real Sociedad was only able to reply with 1 goal in the 86th minute, but this was not enough to catch up and instead the visitors added to their total goals in the additional minutes.
I don't think this was an intentional defeat, but Villareal played very well and efficiently in this match. Real Sociedad certainly wants this match to win three points to reduce points with Bilbao who are in fourth place. But sadly Villarreal seem to have found their groove, they are unbeaten on six occasions, winning two and drawing four but playing much better. Meanwhile, Real Sociedad is moving in the opposite direction.
In this match, Villarreal also showed better teamwork, even though they controlled the ball for a shorter time, this did not prevent them from being more attacking and assertive. because they managed to fire four shots at Real Sociedad's goal and three of their shots resulted in goals.