Jameskegel said that in any "mainstream distributions", after you run an update but before you reboot, the OS is running the updated libraries. I honestly don't understand how that is possible.
No, what you said was: "until you reboot, your Linux box is still running the known-buggy code"
And then later in the same post (just so we're clear about what you said): "But unless you reboot after installing your Linux updates, your computer still has the bugs."