I can remember youth hockey coaches in the 1970s and 80s telling me to “buzz the ear” of the goaltender, especially on the blocker side when he went down. I’m sure it goes back way further than that, it is very difficult to stop shot that’s blocker side and at ear level.
We even had training aids that attached to the front of the goal, and more than one of them I can recall featured a target hole on either side of the goalie’s head.
Shortside high is different from banking off the backside of the helmet from below the goal line…if your coach was truly trying to teach the below the goal line bank shot then he was a time traveler