I believe that the study, which i did delve into somewhat, is not intended to dismiss the role of intensity in cardiac remodeling, but more specifically, to downplay it's significance relative to exercise duration in the role of cardiac remodeling. And the study states that it started from the premise that intensity has historically been thought to be more effective than duration.
With that said, it doesn't pose the comparison as an either-or approach, just as to which was yielding higher outcomes and adaptations.
Here is as good a summary paragraph as I could find, which cuts to the issue:
"Our finding that exercise duration outweighs intensity carries important clinical implications. Current guidelines for sport participation often prioritize exercise intensity, while exercise duration is given less weight. Our data suggest that both exercise intensity and total exercise duration should be jointly considered when providing training recommendations, particularly for athletes and patients at risk for cardiac remodelling. This dual consideration could enhance individualized exercise prescriptions, improving both safety and performance outcomes."