This is plain untrue. As explained in The Economist article, this Wright guy began approaching a (well-known and respected) author about writing is biography months before the first outing in December. There would be nothing to tell in his biography if he's not Bitcoin's inventor.
He may be or not be Bitcoin's inventor (I strongly suspect he isn't) but in both cases he really wanted to be known, at least starting in mid-2015.
He was forced to. He doesn't want to be public, and he wishes he didn't have to be.