It’ll prove that if you leave your doors open, with the keys in the ignition, and engine running, and walk away for a while, then your car will get stolen regardless of its age. The whole video is a straw man.
If you truly believed your later version would do better, you’d turn off all its protections because it wouldn’t need them. If you turn off all the things protecting your PC what do you expect?
The demonstration was just that; an extreme example to make the point that some vulnerabilities don't need the user to access a dodgy site or software. A fully patched OS is the last layer of security, and is necessary because the other protections don't have total coverage. I'd expect the same test done with a recent patched OS to show the OS not being compromised, or at worst a lot longer before the machine is compromised