From your same source, it would appear the German Military Minister agrees with the US Ambassador.
You appear to enjoy a quote that you agree with but seemed to have overlooked a differing German view of the same matter....by the fellow charged with overing the military affairs of the German government.
I shall not "quote" the Military Commissioner but he does seem quite concerned about the failure of the German government to live up to its pledge of financial support to NATO.
https://www.dw.com/en/german-militar...nts/a-47972229