Your thinking and statement is flawed.
You are accepting his statement as fact when it is not.
First off,you are taking all the info from one repair facility in one part of the country.
If you want a real figure on mechanical problems,take a survey from at least 20 repair facilities in each state.
Second,all the vehicles sold here in the US are not evenly distributed,a lot of the four wheel drive vehicles end up in the snow belt and a lot of the convertables end up in the sun belt.This mere fact will skew any poll taken.(Say there are 25,000 more jeeps in Michigan than in California,Michigan is going to have a higher repair rate due to the sheer numbers of Jeeps in that state)
Third,different states have different repair rates (Some states have a higher repair rate) due to the fact of the driving habits,road conditions and weather conditions of that particular state.
Fourth,The economy of that certain state can and will dictate the repair rate because of wealth,rich people are more likely to keep there cars in excellent repair compared to the less rich which will raise the repair rate of certain vehicles while others will have a lower rate of repair.
Fifth,The actual percieved value of a vehicle will also dictate repair rates,a less expensive car will visit the repair facility less often than an expensive car because that particular car is less valuable and the owners are less likely to spend more money on it's upkeep than a car that has a higher value.
I have been in the repair business for 21 years now and the only way to reliably judge a vehicles reliability is by T.S.B.'s (Technical Service Bullitens) which are published by the auto manufactures under federal law.These T.S.B.'s can be purchased at your dealership for a small fee.