Like probably a lot of people here, I read the headline and said to myself "no shit, of course diet matters" but then I read the article and the conclusion is actually pretty interesting: CICO is of course still king and that's not at all what this is about; this group did a mouse study and found that when they increased the amount of exercise available to the mice (and they started to exercise more), something happened that was not fatigue related that cause them to be MORE sedentary when they were not exercising, and in fact the increase in sedentary behavior almost perfectly counteracted the increased energy consumption from the running (they still ended up slightly net negative but extremely minor).
It's a short article and worth the read. Still a garbage headline.