Chinese media reported:
The 2018 Asian Windsurfing Championships and Asian Kite Board Championships were co-sponsored by the Asian Sailing Federation, the International Kite Board Association, and the China Yachting and Windsurfing Association.
The level of windsurfing competitions is divided into: T293 - boys and girls (under 15), young men and women (under 17); Gaastra - young men and women (under 19), adult men and women Group; RS: X - young men and women (under 19), adult men and women.
I also checked on the Chinese Taipei Sailing Association. As a result, they did not have any information on the windsurfing Asian Championships.