The wording in the link I attached didn't differentiate between Ford or Roush as far as the warranty goes.
I read it and it does.
It says for everything you go to Ford except the supercharge you need to go to a roush certified dealership.
This means Ford can still void your warranty for getting that installed if they really wanted to and make you bring it to the selling dealership to do the repairs under their warranty.
This looks no different then if a shade tree mechanic installed the supercharger for you except hoping this dealership knows wtf they are doing.
Still a nice option to have at least, would be nice if backed by Ford though.
Q: What is the warranty on the vehicle?
A: This truck will have a 3 year / 36,000 mile bumper to bumper warranty. It also has a 3 year / 36,000 mile powertrain warranty.
Q: I live pretty far away from you. What happens if I need to get this vehicle serviced close to me? Can my local dealer make repairs?
A: Yes! If you have an issue with something unrelated to the supercharger you can take it to any Ford Dealership for repairs. As an example, if your radio goes out, that obviously has nothing to do with the Supercharger and you can take it to any Ford Dealership for repairs. If you experience any issues with the Supercharger (which is VERY RARE), you can take it to one of HUNDREDS of Roush Certified Dealers across the United States.