That was done by the most hard-core of skeptics, Ray Hyman, and he conceded that he has no explanation for the statistical anomalies.
Also, in addition to the above (by Hyman, which directly conflicts with what you've stated), here's an article by Hyman on how disingenuous the claims of parapsychology researchers can be, the disconnect between what they claim to be addressing and what they address, and how he showed up to a conference on "anomalous cognition" he thought would address the claims that it was explicitly (according to the organizers) supposed to address, when in actually he was alone in doing so:
Anomalous Cognition? A Second Perspective
I'd be curious to know where Hyman "conceded that he has no explanation for the statistical anomalies" given how he has repeatedly stated there are none, the studies and meta-analyses supporting claims regarding parapsychology are flawed, inconsistent, and can't be replicated, yet nowhere gives any indication that there is some aspect of their results that can't be explained. We belong to at least two of the same groups/associations, so while I've never met him, I do have more ways to contact him directly than are available to most, but that doesn't mean he checks these regularly or, if he does, that he'd respond. However, there is the fact that he has published nothing but criticisms that never admit to anything being unexplained for 60 years:
Hyman, R. (1957). Review of Modern Experiments in Telepathy, Second Edition.
American Statistical Association Journal, 52, 607–610.
Hyman, R. (1981). The psychic reading.
Annals of the New York Academy of Sciences,
364(1), 169-181.
Hyman, R. (1982). Does the ganzfeld experiment answer the critics' objections.
Research in parapsychology, 21-23.
Hyman, R. (1984). Searching for patterns: Meta-analysis and parapsychology.
RA White & J. Solfvin (Ms.), Research in Parapsychology, 114-115.
Hyman, R. (1985). The ganzfeld psi experiment: A critical appraisal.
Journal of Parapsychology.
Hyman, R. (1986). Parapsychological research: A tutorial review and critical appraisal.
Proceedings of the IEEE,
74(6), 823-849.
Hyman, R. (1988). Psi experiments: Do the best parapsychological experiments justify the claims for psi?.
Experientia,
44(4), 315-322.
Hyman, R. (1987). Parapsychology: The science of ostensible anomalies.
Behavioral and Brain Sciences,
10(04), 593-594.
Hyman, R. (1989).
The elusive quarry: A scientific appraisal of psychical research. prometheus books.
Hyman, R. (1994). Anomaly or Artifact? Comments on Bern and Honorton.
Psychological Bulletin,
115(1), 19-24.
Hyman, R. (2010). Parapsychology’s achilles heel: persistent inconsistency.
Debating psychic experience: Human potential or human illusion, 43-52.
...and so forth.