Yea PCC instructions for some countries seem to be slightly outdated. I know for UAE they accept e-PCC (heard people who got PR via EE after submitting e-PCC) and there is no stamp, just e-signature. And there are instructions on how to verify the validity or authenticity of the e-PCC (which i'm guessing CIC does for all PCCs, whether electronic or not, don't quote me though, i'm just speculating this).
Countries like Kazakhstan, CIC specifically mentions on its website that it does not allow online (or electronic) PCC. Therefore, the applicant from such a country should only get a physical PCC.