absolutely, they are one of the best in the whole FPS business at map making. Valorant maps all come from CS:GO templates.
Other than Cbble which is a special case that they probably wanted to get rid off,
all the rest? Is Valve made and reworked. Train, Overpass, inferno, Dust2, nuke, vertigo.. mirage. All of the reworks are from them, and almost all of them i would say are good and improved each map.
then u look at cache which is from FMPONE, and its a weird looking jungle.