A Twitter thread from Michael Nicolls described a reported approximately 200 meter close approach between one of nine satellites launched from Jiuquan and STARLINK-6079 (NORAD 56120) at about 560 km altitude a few days after that Chinese launch.
Michael Nicolls, Vice President of Engineering at SpaceX, stated that a spacecraft deployed from China came within 200 meters of the STARLINK-6079 satellite at an altitude of 560 kilometers.