think we are talking about two different things. I am talking about the extended warranty (ESA), not about supercharging. I believe that free supercharging on pre-2017 cars always follows the car, regardless of ownership.
But, as for extended warranty, my understanding is that if a car is ever owned by anybody other than an individual private party (for example, a dealer), then that car is never eligible to purchase an ESA. Do you disagree with this statement?
And, on a related note, did your "broker" set up a deal between you and a private party in which the title transferred directly from that private party to you? If so, I suspect there is no impact on ESA eligibility. But every broker I've dealt with is either hawking cars owned by dealerships, leasing companies, and/or the brokerage company itself.