I don’t think so, SpaceX claimed (and NASA apparently verified) that the development costs for the Falcon 9 were $300 million. It’s in the Wikipedia article, also here: https://newspaceeconomy.ca/2022/10/23/how-much-would-falcon-9-have-cost-if-it-was-developed-by-nasa/?amp=1
I was under the impression that the Falcon Heavy was a ground-up development. But in any case the Falcon 9 was cheaper, so go figure…