The rebate would've needed to be locked in on the order or in the purchase/buyer's order or agreement you might have signed with the dealer
"Sold Order Protection" supposedly:
www.hellcat.org
"Sold Order Protection" supposedly:

Locking in power dollars rebate on a custom order
If I order a 2020 hellcat today, is it possible to lock in the power dollars rebate? So even if it takes 4 months to be delivered and FCA has stopped the power dollars in that time, I could still get the rebate because I ordered while it was still going on. Thanks!