Why would a health care org care about air-gapped deployments? Most (really, almost all) health care data is stored on cloud SAAS databases already; for people who care, this vendor already had an on-prem version.
What you say makes sense, but I think there can be reasons. For our military customers we offer an air-gapped version of our app early on because it was easier for customers than getting an ATO. Also as a bootstrapped company it was a lot cheaper than FedRAMP. I'm guessing I'd lean on a similar strategy if I had a health care startup.