It is very likely that the Professors were asked to keep the confidentiality about what they had seen. All they could say was definitely written in the report, the rest (if any) had to keep it for themselves
That does seem likely. But it was unbecoming of academic scientists. It was bad behavior. The study and the report were both terrible. Filled with holes that many people pointed out, including me. The researchers should have either answered the critics or retracted the paper. When academic scientists make a glaring error, they should always retract.