The Sprint cars never sold up to expectations. IIRC they were the product of Jay Adams while product manager. He liked Sprit cars and got them pushed through. I can see Revell doing NASCAR kits before a new tool Sprint car kit and I do not see them doing the 2022 Cup Car kit.
Add that the money guys are now in Germany and you see how hard it would be to get a Sprint car kit, new or updated. If Ed Sexton is still working for/with Revell(Germany) he'd be the one to talk to.