Black's formation at the top has been coined the orthodox fuseki. Instead of the traditional wedge at the top, which already had fallen out of grace with modern professionals, AI like Katago prefer a move in the upper left corner, either an early 3-3 invasion at a or an approach at b.
The wedge had already fallen out of grace with the pros. By KataGo's evaluation, White loses >2 points with respect to a or b. Black's response this early in the game is to invade any of the two bottom corners.