I don't know the way these reports are structured, but is it regular enough where there's even a possibility that a bot could digest, analyze, and act on the information there in near real time?
How can you read this chart, and infer from it that the activity is due to having already read the report?
Surely everyone knew that the report would be released at 10:30, and they had strategies (or hedged positions) that were not as likely to be influenced by the contents of the report as by the market forces surrounding their orders?
Edit to clarify.