Honestly, even if we'd notified you as soon as we heard rumors of a naval assault, you never could have arrived in time. Aurvandil moves quickly and in great force.
This is basically why Kale didn't bring it up to anyone: he just previously sent out urgent "Come to our aid against Asylon!" and when we learned Aurvandil was coming (only a few days prior to their landing) it was way to late to get help and any aid that did come would arrive weeks after they were sitting back at home in Aurvandil.
EDIT: Also, funny thing is everyone in Terran is pretty apathetic to it all...