1 - you are absolutely correct. A wind MW does not generate as many MWh as a nuclear MW. Still, in terms of showing that the scale of development of wind matches that of nuclear, the graph is relevant.

2 - the study I quote only uses data up to 2006, so the boom in solar over the past 2 years is probably not visible in these graphs.

In the long run, we're all dead. John Maynard Keynes