Yes there is a way to programatically restart a iOS app. It is tho through a private API. Basically iOS has a daemon called Launch Services Daemon(lsd), this daemon is able to open any app with any bundleid on the device. You can open ur own app, yes it won't work by just opening ur own app. It's possible to trigger a race condition by invoking the app openage while you exit your app via exit(0) as your own app doesn't trigger the reopen but the XPC daemon lsd, and when it triggers it ur app is already dead... And it opens it..

https://github.com/ProjectNyxian/Nyxian/blob/main/Nyxian%2FLindChain%2FPrivate%2FRestart.m