I don't understand where systems thinking comes in to this. Because anybody who has thought at all about systems will realise they the are complex and hard to predict (because we can't know everything about the system), and therefore that the way forward is to make small changes and see how the system reacts to them... which seems to be exactly what Peters is advocating.

I don't know how the term is used in management consulting circles. Perhaps "systems thinking" has nothing to do with either systems or thinking, and it's just the latest buzzword that management consultants use to carry on selling what they always have. But if that were true, it would surely say more about management consulting than about systems thinking.