Has the HPAT really failed to measure empathy?

Results of the HPAT empathy test do not correlate with scales we typically use to measure empathy. Is this a design flaw of the paper?

A study from University College Cork has recently been published investigating the link between medical students’ scores on HPAT Section 2 and a questionnaire called the Jefferson Scale of Physician Empathy.

The researchers’ conclusion was that “JSE [Jefferson Scale of