If you swap out the CPU on your computer, is your computer still the same computer? Something has changed. Perhaps a more accurate way of looking at a model name like an F91W is that it's a configuration of components. Ergo, an "F91W configuration can be modified to do xyz". Is it based off of an F91W? Yup. The information that's being conveyed is that if you own a cheap F91W, for a few bucks in parts and a little time, you can do something interesting with it.