Associate Professor Karl-Heinz Wyrwoll has littered his article with qualifiers:

* During the last few decades, human-induced climate change has been a pervasive theme in the scientific literature.

* Ruddiman’s research, while not without its critics, suggests that these resultant climatic changes ...

* This is the idea that early agriculturalists caused an anomalous reversal ...

* He showed that vegetation clearing, overgrazing and burning may have had an impact ...

* Tom Lyons’ “bunny fence” experiments have drawn attention to likely climate impacts and feedbacks ...

etc.

I'm neither agreeing nor disagreeing with the notions put forward, just highlighting that the article is not as you paraphrased it.