Paul’s words identify Jesus with Yahweh. In Psalm 68:18 it was Yahweh who is described as the conqueror of the demonic stronghold. For Paul it is Jesus, the incarnate second Yahweh, surrounded by the demonic elohim, “bulls of Bashan,” fulfilling the imagery of Psalm 68. Jesus puts the evil gods “to an open shame” (ESV) by “triumphing over them by [the cross]” (LEB) (Col 2:15). Psalm 68:18 and Ephesians 4:8 are in agreement if one sees conquest, not liberation.
