This is probably just a result of division by a small number as this study compares percentage increase, not absolute. This could just as well be statistical noise. That's the realist view.
The optimist view now. I have seen an increasing desire to publish in some colleagues and this MAAAY be a sign of a turning tide.
That being said, there are serious structural problems with how HEC rewards research and what the research culture is. Pervez Hoodbhouys articles on this topic are spot on. The problems he identifies, I have experienced first-hand.
Yes there are maybe 2% professors writing actual publish worthy work but this endeavor needs concentrated structural reforms before well see any actual and consistent growth.