That observation doesn't address my criticism of 1003.3.3. My point is that if the top of the AED were 81" AFF, there would be no 1003.3.3 violation, despite it still being a head knocker.
I'm not familiar with Chapter 10 of the IBC, but looking at 1003.3, seems like 1003.3.1 second paragraph is also relevant:
"A barrier shall be provided where the vertical clearance above a circulation path is less than 80 inches (2032 mm) high above the finished floor. The leading edge of such a barrier shall be located 27 inches (686 mm) maximum above the finished floor."
But that section is also worded poorly, it needs to have an exception for the region within 4" from the wall to coordinate with 1003.3.3.
Cheers, Wayne