People who study human memory have also known this for a long while. That is not the novelty of the finding. The novelty is the bridging of a memory paradigm of transitive inference which I believe has been shown to critically depend on hippocampal binding operations, and the effect of stress on that memory supporting hippocampal operation. I've been out of the memory field for about 10 years now moving on to autism research, but was very much exclusively in the hippocampal-dependent memory research field during my phD work. This is a good research team, and I have colleagues who have worked with some of the authors (e.g. Allison Preston). In any case, this is the type of study that is much much much more focused on current theory of a hippocampal operations supporting memory than non-hippocampal contributions (e.g. encoding / retrieval mnemonics, etc). The point is that the take home for scientists in the field won't be much like what a news clip might write about the study (but props to the submitter for giving the actual study link!)