License agreements from the package:

> Your use of Symbols obtained from Apple’s SF Font is limited to creating mock-ups of user interfaces for software products running on Apple’s iOS, iPadOS, macOS and tvOS operating systems and your use of Symbols obtained from Apple’s SF Compact Font is limited to creating mock-ups of user interfaces for software products running on Apple’s iOS, iPadOS, macOS, tvOS and watchOS operating systems.

So likely not.

Does this mean you’re also not allowed to use it for iOS apps in the app store?

Nope. SF Symbols is quite useful (for native apps). There are libraries of things like ISO symbols, though. Here's one that I have used: https://github.com/tabler/tabler-icons

Unfortunately not.