That's standard pop-sci title inflation. The article is about how evidence from analyzing fish buried in debris tsunamis indicates that the impact happened in S

That's standard pop-sci title inflation. The article is about how evidence from analyzing fish buried in debris tsunamis indicates that the impact happened in Spring (in the Northern Hemisphere). That is a genuine contribution to understanding what happened. You're right that the hibernation thing is pretty speculative -- but it's also a falsifiable hypothesis that other evidence could shed light on later, so it's not like we shouldn't talk about it.