Great question Jürgen. I've seen this happen countless times, but without a configuration, I don't know if the timeline can be reset. Libby Taylor, have you dealt with this during any new group/space creation over the years?
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Whenever we move anything it resets the date, I believe. I'm not sure if different content types behave differently, for example, blogs might keep their correct date timeline because that's part of the URL. However discussions will be marked as the latest activity happening on the day it was moved which can confuse people.
I suppose I'd suggest just moving the content with the knowledge that new content and new comments on those older discussions will start to re-establish a more real timeline on your recent activity over the course of a month or two.