AFCI's have everyone changing and or challenging methods....a 'backburn'scenario
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I believe the 210.11 EX overrules 210.23 EX, we may get into a 'NEC style' interpetation though....as for ampacity 210.23 and the 50-80% rules appear.....(2)'s dual reference to lighting units is confusing here......

(1) Cord-and-Plug-Connected Equipment. The rating of any one cord-and-plug-connected utilization equipment shall not exceed 80 percent of the branch-circuit ampere rating.
(2) Utilization Equipment Fastened in Place. The total rating of utilization equipment fastened in place, other than luminaires (lighting fixtures), shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied.