The "may have" appears to come directly the NIAID's news release. If you think that NIAID or the DSMB is trying to smear AZ, then sure. Otherwise, keeping thin

The "may have" appears to come directly the NIAID's news release. If you think that NIAID or the DSMB is trying to smear AZ, then sure. Otherwise, keeping things vague provides maximum room for maneuver for both groups to resolve the issue without either group losing too much face. This way things can get chalked up to "mis-understandings" of what the requirements were, and AZ can reclarify their data in light of these new requirements.