You are assuming way too much about this exploit. We know nothing about it. You can't say what it does or doesn't do. Hence why I said in my original post "If it works as advertised" because none of us know how it works.The way I would do it would be to run the signature check multiple times with random delays and randomly have some tests that will pass and some that will fail. Making sure that all the tests have to run for the code to work, not just an "if" test at the end.
Also with how early this appears to be in the boot process (given the custom logo in the video), I would bet if nintendo did add more security checks like that, you could likely just patch them out with a cfw update. It will be like 3ds when we had to wait and see if it was safe before updating.