kang kang is 20 and been playing valorant professionally right when the game came out. That's 4 years of grinding. Before that he was competing in cf as well https://twitter.com/subzidite2/status/1561003354335354881. He obviously need grinding before he can compete in that game. When the fuck did he have the time to "grind cs way longer than val".
Ofc he gonna say hes not good in cs go considering he was way too young when he plays the game and everyone else was way a head. It might be a different story if cs is a main fps game in China and he was commited, you dont know.