No, I didn't. The first link is a 3rd party software (iMazing) and the second is a developer guide how to develop an App in a way that it will also run on macOS without recompilation. Also note, that just because that software exists that checks if the the system is run outside of secure mode and then refuses to run, that doesn't make the system a "walled garden". There is a whole class of Software that has been doing this for ages, it's called Anti-Cheat Software and mostly home to Windows.
M1 Macs can run iOS apps natively. The only catch is that it's up to devs to allow them to be installed from the Mac App store. Using iMazing is a workaround for apps that the devs don't enable to be installed from the App Store.
