Found the answer in obscure amzn PDF:
“If an HIT is submitted that violates the Turk Engine for the relevant content, the Mechanical Turk User may request that the HIT be reviewed by the administrator. HITReviewStatus indicates whether the HIT has not been reviewed, was marked for review by the user or has been reviewed by the administrator and is deemed appropriate or inappropriate . "
SO, it looks like HITReviewStatus is an internal audit status for AMZN.
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