Rental car reimbursement and a loaner are two totally different things.
The loaner is a convenient, courteous, offer that only some dealerships will do.

The rental car reimbursement is for instances similar to when you're out of your vehicles for days/weeks at a time due to repair work or an accident. This means you physically get a rental yourself, you file the claim with the ESP provider, and they eventually cut you some sort of funds in return.