The Point Estimator page and the Map Pilot camera parameters are the same.
It looks like you may be putting 150 in the Altitude AGL which is labeled with units as meters. This would be 46 meters. When you put in 46 meters (for 150 ft) the GSD value goes to 1.3 cm/pixel.
The speed doesn't have anything to do with this calculation. GSD is solely dependent on sensor size, sensor resolution, lens FOV, and Altitude AGL.