The Warriors and Kuminga have been dancing around each other for months. Currently, the ball is in Kuminga's court in the form of a $75 million, three year contract.
For Kuminga, the bigger concern is how he fits into the Warrior's on-court strategy. His role, minutes, and usage change erratically from week-to-week. Apparently, he has gone so far as asking the Warriors if they even actually want him there.
Kuminga is likely worried that the Warriors are just trying to pay him to stay just to keep him from playing for another team and have no real plan in place for him.