Active voice there feels like they're shifting the blame to their employees, which is never a good look for an employer. I think they did the right thing by keeping it focused on their lack of planning/foresight.

This seems to specifically imply that illness in training pilots and pilot trainers is the cause.

I would expect a more passive version to be "Trainings were canceled and delayed due to the Omicron surge..." which doesn't specify if anyone got sick.