The post says nothing about drive or battery, the iFixit teardown does confirm the battery can't be replaced (it's now glued in — where the old one was screwed to the case — the teardown guys didn't dare removing it after trying a bit) so there's that.

On the other hand, the SSD is most definitely replaceable, it's the same system as in the Macbook Air (though apparently not the exact same drive): http://www.ifixit.com/Teardown/MacBook-Pro-with-Retina-Displ...