I have yet to read the full article, however, from the summary, the authors seemed to have accounted for some possible reasons as to why odor recognition was impaired. Since they can detect different odors, they should be able to taste and it would be interesting to see whether they score higher on taste recognition. Unfortunately, one concern I have is that the amygdala (an area responsible for emotion and fear-conditioning) connects to the olfactory bulb. Since it has stunted function, there is certainly a possibility that the lack of emotional recognition of smells affects their recognition. This process of emotional regulation, proper identification, integration with planning, etc... certainly involves the frontal brain areas, however, other areas, such as the insula, insular cortex and amydala are not in the front, so I'm interested to see how they arrived at that specific conclusion.