Based on what I know about the WPPSI "comprehension" subtest, from taking a Wechsler Adult Intelligence Scales Revised (WAIS-R) test in the early 1990s, and from reading practitioners' manuals about IQ test administration since then, I would expert an expert AI system to correctly answer some but not all of the WPPSI comprehension subtest items. I wonder if the professional paper on this issue will provide more details of the system's subtest scores for each WPPSI subtest.