Long March 9 or 10? My understanding was that 10 is closer to Falcon Heavy, will not be reusable (maybe this changed for the first stage??), and will be ready to launch in a few years. Meanwhile 9 is closed to Starship, will eventually be reusable, and still has like a decade to go.
CZ-10 has a diameter of 5 meters so maybe CASC is talking about it here, or maybe there's a new rocket being developed.