While E-33 is indeed bactricidal, it is also corrosive and will cause deterioration of a wound and a chemical burn.
The individual who approved this protocol shoiuld be criminally charged and dismissed.
You have a situation requiring immediate action and intervention.
The use of E-33 for diabetic wound care is not acceptable nursing home practice.
Take your friend to the closest ER and have a real doctor treat your friend's wound. Then report the nursing home to the proper authorities in your area.