100% agreed, Russian do invent entirely fabricated stories, but they are short-lived and don't resonate widely. The fabricated story "criminal case of Lisa F" (2016) had life time of a few weeks, but the fall out of Merkel's "Wir schaffen das" from 2015 lives well till today - because it resonated, certainly with a lot of help from Russia but that wasn't the deciding factor I suppose. Interestingly, Russians didn't poke Germans much on the nuclear phase-out, quite the opposite to be fair, they were very supportive of it, which kind of tells you where this idea might have come from.