“Wasn’t the system supposed to be fixed?“

Why would it be fixed? Insurance companies aren’t willing to invest in oversight, and everyone else profit, there is no incentive for changing the system.

"In at least one case cited in the investigation, baking powder was mixed into food to make tourists physically unwell."

The only ill effect I can find from overconsumption is a "tingly sensation on the tongue". Of course, that doesn't mean the 'poisoner' wasn't ignorant of this, and genuinely did it trying to make them sick. Or maybe they simply said, "If you feel your tongue tingling, YOU ARE DYING!!!".