Did you read the statement you posted? It's not asking Germany to increase nuclear. It starts off talking about all the economic benefits that US corporations have had for Germany and then goes to suggest utilizing future U.S. liquefied natural gas exports to "enhance European energy security"

(finishing off with an apology for the NSA spying on the German chancellor)

I'd highly recommend you read it. It makes it abundantly clear that the US wants Germany to rely more on the US for energy security than anything else.