The way it's stated, to me, indicates clear coordination: "Members of the group have protected O’Rourke’s secret for decades, reluctant to compromise his political viability. Now, in a series of interviews, CDC members have acknowledged O’Rourke as one of their own. In all, more than a dozen members of the group agreed to be named for the first time in a book about the hacking group by this reporter that is scheduled to be published in June by Public Affairs. O’Rourke was interviewed early in his run for the Senate".
So the reporter interviewed him first then went to the other members, who somehow "flipped" uncharacteristically (unlike they had done before). The book will be published in June but the reporter decided to start banging the drum much earlier, which is more convenient for O'Rourke than for his sales (he's basically given all the good bits away already). If he wanted to maximize exposure and sales, he would have waited for the eve of a primary; like this, it helps O'Rourke get the dirt out early.
