Board Thread:Inclusion debates/@comment-1272640-20161223201024/@comment-20607870-20161228104101

an interview on Kasterborous: Of course, the way things are today, nothing is canonical. But then everything is canonical in a way. If the Time War has changed everything and left continuity up in the air, then Shalka might once have happened…!

This implies during and after production, he still considered it "canonical" however in a different way.