Why put these resurrectional themes into a psalm about judging the gods, about putting the fallen angels in their place and working justice upon them? It is because the whole cosmic narrative of the Scripture is about the war begun by these fallen ones against God.
The targeted demonic attacks we experience especially in this holy season are real, and we can spot them because of how they are so specifically designed to pull us away from participating in it. But these things do indeed come out by prayer and fasting.
However you want to understand why there are demons on the earth even now, it is true that they are real and they are present. It is true that the suffering of this world is closely associated with their activity.