Another potential source of confusion, is that the author might be considering the more extreme "Locked in" individuals with extreme autism, who are often unable to properly verbalize with complete sentences, and are often characterized with "
Blunted affect." (EG, providing a structured investigation of an easy to arrange enrichment activity that can greatly enrich such a person's difficult life, since understanding what does and does not illicit positive emotional reactions in extreme autists can be challenging for neurotypical people.)
It is still the same situation as with high functioning autists, in as much as the autist simply does not register the stimulus as one that should illicit an emotional reaction. However, the observant investigator should note that "Emotional disturbances" are common with such extreme autists, caused by disruptions to their routines or preferences. This clearly indicates emotional faculty is present, and that the disorder is not characterized by a complete state of anhedonia or other lack of emotional
CAPACITY but is better characterized as a deficit in social interaction registration, cue recognition, or other "intrinsic" in neurotypical individuals normally associated with emotional regulation and expression.
I would LIKE to give the benefit of the doubt that the author is seeking to be "informative" to uneducated individuals that might harbor such a false presumption (Autists do not have emotions), and to provide a structured examination of autists displaying emotional performance to "normal" stimuli, such as seeing fine art, as a structured refutation.
I feel that the opening of the paper should have clarified this intent in the abstract portion, just for good measure, so that it is not confused with having the researcher present themselves as such an uneducated hack... but them's the breaks I guess.