It's not a finalized deal, just everyone jumping the gun.
"Jagex is in early stage discussions with the firm in question, but we must stress that they may – or may not – materialise into anything."
The company at hand is an iron mining company and has no knowledge or experience in the gaming indsutry let alone investing (this company is losing profits and is the reason they are interested in investing here).
Jagex is still Jagex and this company is not going to be taking over Runescape, any money they buy into it will just be an investement not to take control over the game.