Nope, not being lied to. That's just the way it is. It's even in my Roush owners manual supplement. I have accepted it. It is just part of owning a Roush Mustang. It wouldn't matter anyway as I am ready for a power adder, I just wish I had purchased ia blower sooner, but spending money to ensure the car is ready for the added power (suspension & brakes) was a must. I believe you have to be able to stop and turn as well as go fast, lol.
As far as the warranty issue, if you don't believe me on the warranty, you are welcome to do your own research on the topic.
2013 RS1, 1 of 1 Grabber Blue w/pearl, 6M. Brembo package, Roush Performance suspension upgrade. Roush Performance exhaust. Roush Phase 1 TVS.