He never had a shot at a clear majority, which is what it would take for his party to form a government since every other party publicly pledged that they will never be part of a coalition with Wilders party.
He had a shot at becoming head of the party with the most seats. As such he would have been asked to form a government. That would have been a win. As it is now people are saying he really won because his party picked up seats. Well the Democrats picked up seats last November. That didn't make them winners.