Tesla's acceleration in all situations is a real strength. Obviously a M3P will blow the doors off a GT (and a MYP will as well to a lesser extent) but from my experience and the testing I've seen that gap gets even bigger at less than ideal situations i.e. at low SoC, when the batteries aren't...
I wouldn't even say "great deal" I would just say "do you care about performance" and on top of that I would add "do you ever find yourself passing people on a 2 lane 65+ mph highway" and if the answer is yes I'd tell them to look elsewhere.
That's not the car he's talking about, that Ford is the regular GT500 straight from Ford, never went to Shelby American.
The car he's talking about is the Ford Shelby GT which is based on the regular Mustang GT (not the GT500).
e: beaten to the punch