CATSA received the information and categorized it, as you said, by its nature. If they had been capturing it by status, it would have meant, for example, that a complaint lodged about a service dog, as opposed to being lodged about security screening, might have been lodged in relation to a person with a disability.
Had they done that, it would have given them the opportunity to better analyze the data and understand whether or not other actions should have been taken.