Apple deploys a ton of their server stuff on Linux. Plus they appear to be doing all new code in Swift and moving old code over slowly.

They’re also using embedded Swift in the Secure Enclaves and other small processors due to its safety, though I think they have an extra layer of automated security checking that they use internally that doesn’t exist in the public builds.

But in short, yes. I believe they’re trying to use Swift for everything at this point and getting away from C/C++/whatever even for kernel work.