According to Leland Chee's "Ask Lobot" article in Star Wars Insider 101, "There has been some suggestion that the Toonbuck Toora we see on Geonosis was actually a Shi'ido shape-shifter involved in a duplicitous ploy to bring Sy Myrth to the Confederacy. In that scenario, the plot is ultimately foiled, leaving the planet firmly loyal to the Republic." If this scenario is made canon, the HNN stories of the planet seceding will have to reflect an untrue rumor in-universe.