I think he simply got horrible advice and there was no one on the Board to challenge him. He's probably shell shocked and is feeling paralyzed.
CEOs hate to admit they're wrong. It takes them time to come to grips with that reality. The good ones recognize the mistake quickly and stop the avalanche from accumulating. Unfortunately, he hasn't demonstrated acumen in terms of capital markets.
Perhaps the guy on Twitter that was promoting the stock and has also taken a reputational hit will knock some sense into Stephenson.