Corki Special Delivery Valkyrie (W) Uninterruptable?

I'm not sure if this is intended or not, but I looked through the official wording on his kit and it doesn't say anything about his w being uninterruptible even when using Special Delivery. I nami ulted him mid-way and he went right through the middle of it like it was nothing. There was no spellshield or anything in play to negate it either. It did say "Can't be disabled", though.

This occurred during match ID #2057737214. Check out my replay.gg match on 01/03/2016 at 1:03 PM to view it yourself.

I suggest removing this uninterruptibility. However, if it were to stay, then the tooltips should be updated to indicate that the dash cannot be interrupted.