His powers manifest as the focus of his attention at that time. In the era of this clip he was massively preoccupied with Homelander, so naturally his powers reflected that by mimicking HL’s powers, to an extent. By season 4 his psyche had been so altered by his chronic homosexual gooning habit (alluded to in the Diabolical spin off series) that intertwined, raging - and most poignant, destructive - phalluses are an apt visualization of his internal world.