In my opinion in 430.22 E it is not about motor but conductor ampacity.
It is, but properties and use of the motor have an impact on which multiplier you use.
My mentioning the frequent reversing motor - I had a dual head bagging machine once that had final bag feed auger that would reverse to change product flow from one head to the other. product feed was in center of auger and it went either right or left depending on which bag you were filling, and was controlled by the bag scales. Operator would change filled bag while other bag was filling, took maybe couple minutes to fill a bag. Reversing was instant, across the line reverse so that motor saw a lot of near locked rotor current during a shift, and at one time this plant did run 24/7 although production might have had occasional break in product flow. Motor was general purpose continuous duty motor. If it weren't for the frequent reversing probably could have been 1/4 hp or less as it was a 4 inch auger moving powder at a relatively slow rate through only a 24-36" long tube either direction from the center supply. 430.22 had nothing to do with determining how big the motor needed to be to be able to handle the frequent reversing, but at same time was somewhat insignificant as a 14 AWG supply conductor had well over the 140% ampacity the table requires as well on this particular application.
This auger had motor fail one time don't recall original motor HP probably 1/2, but the only 56C motor they had on hand at the time was a 2HP so it got put on there. Next failure, did take some time but was maybe less than a year wasn't any electrical component failure but the output shaft failed from all the excess torque upon each reversing cycle.