The Chinese maker is likely aiming this for wide scale production, that means they would need a reliable supply chain of Airframes. Robinson is a strong if small American maker. to get them the PRC would have needed to open a production line in China proper, as the main floor of production is Torrance, California, USA. to get Robinson to open a floor in china would demand either a buy out or convincing Robinson's owner that it was in there interests. Robinson Helicopter Co is still Owned by the Robinson Family. It's CEO is the son of it's founder and it's a stable builder so buy out is unlikely and convincing the ownership to open a floor in the PRC is also doubtful as it's more likely to cost more then the company makes.
Brantly International Inc.is already owned by Superior Aviation Beijing. the only manufacturing plant for there product is already in the PRC. The Current version is also not as dated as you might think. The B2 has been updated form time to time the current version is the Third generation the B2-B and to be frank helicopter technology in the conventional form more or less plateaued until Compound Helicopters and Tiltrotors enter production the most advanced Helicopters in the world are simply adding computer and automotive upgrades.