One can never discount lobbying and influence behind the scenes, but Schroeder finished being Chancellor in 2005, which was six years before the initial post-Fu

One can never discount lobbying and influence behind the scenes, but Schroeder finished being Chancellor in 2005, which was six years before the initial post-Fukushima vote in question, and even longer since various aspects of the plan continued to be supported by various politicians. He'd be a spectacularly successful lobbyist if your suspicion is correct.