They are an example or P that doesn't belong to P', using your terms. Check this talk of the cosmologist Sean Carroll's, he adressess this problem and claims th

They are an example or P that doesn't belong to P', using your terms. Check this talk of the cosmologist Sean Carroll's, he adressess this problem and claims that the underlying physics of our everyday reality are completely known: https://youtu.be/xv0mKsO2goA https://youtu.be/xv0mKsO2goA