From the article:

  > Groq added that it will continue as an “independent company,” led by finance chief Simon Edwards as CEO. 

The $20B does not go to Groq's investors. It goes to Groq. You can say that Groq is owned by its investors, and this is the same thing, but it's not. In order for the money to go to the investors, Groq needs to disburse a dividend, or to buy back shares. There is no indication that this will happen. And what's more, the investors don't even need this to happen. I'm sure any investor that wants to sell their shares in Groq will now find plenty of buyers at a very advantageous price.