Conceptually, I agree. But delivering against what has just become a defined standard (albeit, currently optional for now), maybe, maybe not.
Sq D may have just filtered out "noise" above a certain frequency. The gfci specs all seem to mention operation on 60 Hz systems. That could easily have opened the door to a narrower scope of possible protection while meeting the current spec in place at that time.
The new supplement in UL 943 has a range from 50 hz - 10Khz. Leakage current at the higher hz appears to have less health risk than at 60 as shown in the UL chart for required trip values.