Just because I didn't see a response on this one, you might have read it already in other comments but the packaging bug is a cop out. They are still intending to migrate over to the proprietary SDK, and it will eventually become a requirement for the platform. The only difference was that at the state of the project it wasn't supposed to be a requirement in order to compile, but they do still very intently have a restrictive license on the SDK and you aren't allowed to use the sdk outside of the project. meaning that it has to be present for the program to work and that you're not allowed to use it in other programs.

Why they call it a packaging bug I'm not sure because the end result is the same the package is required for the program to work and that package that is required is not GPL

That being said some other comments have gone a little bit more in detail on it and might be a little more descriptive than me