It looks like you're right, Apple says you can't bundle dylibs outside of a Framework on iOS :\

What would be the difference though, why make the distinction?

> Dynamic libraries outside of a framework bundle, which typically have the file extension .dylib, are not supported on iOS, watchOS, or tvOS, except for the system Swift libraries provided by Xcode.

https://developer.apple.com/library/content/technotes/tn2435...