How come the game hasn't released yet but there are already many teams from big orgs ??
I believe the game gained traction as many during Valorant's early months like all regions. Some tournaments were pushed and major orgs had invested in certain rosters. Then Valorant was scheduled to release in 2021, in like a big, big promotion alongside China's LPL 10 Year Anniversary Event (Heck there were even promotional advertisements), so it was big. But they weren't able to beat out the NPPA freeze which stopped all game publishing and here we are, with China still stuck today.
Yeah, they are quite well versed. Caster Alan (https://twitter.com/AlanGai_) is probably the more well-known Chinese caster that I know that handled Valorant and has contact to the Western side of things(?) Need citation though.