Correct. In fact IIRC, there was a post over on the NVidia forms that stated that you set G-sync for FPS below 60 and the Fastsync for FPS above 60 and you never have any tearing and minimum stuttering since both can be used at the same time.

CPU = i9 9900K, GPU = RTX 2080 Ti, Monitor = 32" 4K G-sync