Except he meant it facetiously. This is obvious from the context.
And Orci himsef confirms that he did not actullay mean it when he said that in comment 102
on your same link.
So, no, Star Trek: Countdown
is not canon.
Active borg technology existing a few years down the line, in order to retrofit the Narada, is canon - which is incompatible with what we learned of Caeliar neutralized borg tech AKA the borg will come back.
Not necessarily. A Singular Destiny
revealed that some Borg technology was still present in the post-Caeliar Milky Way Galaxy, with the potential to be re-activated. Borg technology without actual Borg presence is not incompatible with the events of the Destiny