Well the APPCH speed chart goes down to 180T, and the speed is 121kts. So stick shaker @ 100kts sounds right. More realistic with light wt and lo gas is landing wt of 220T, which is 134kts, so still plausible to have stick shaker around 100kts. My guess is that at stickshaker on a GA, not too many people are going to be focusing on precise speed tape reading.