This is not entirely true in the case of BMW. The dealer may be using a marketing term, but there is an actual difference in the BMW world that matters in the case of EV loaner leasing.
You have service loaners, which in the case of EV’s, require a minimum of 5,500 miles on them or 6 months in service to qualify for any rebates (at time of writing this). It also, in the case of the iX for example, means the rebates are reduced from $9,900 to $5,900.
There are also what is known as “Demonstrator” type retails, which would be something like a car that a manager drove around. They are not loaner cars, and were never entered into the loaner car program. These generally qualify for new car programs, so a Demonstrator may get the full $9,900, vs the $5,900 a loaner would get.
Keep in mind, it’s really only EV’s where there is any difference (again, as of now) between the new car programs and what is offered on a loaner, for everything else, it’s all the same.
Also worth noting that while you may see the benefit of getting an Executive Demo iX that the rebates are 4k higher, however, loaner cars get subsidy money that dealers can use to “write down” the cost of ownership, which help them justify selling them at a steep discount. Demonstrators do not get any kind of payments from BMW, so that is just the dealer taking a loss on the chin, and you may expect a more difficult time negotiating on one.
Hopefully, this is helpful and comprehensive.