I was taught exactly the same and that's over 50 years ago. There is, however, a natural tendency to with your right hand if right handed and left hand if left handed, and it's sometimes hard to break that habit. Pickford is left handed, so maybe he's having trouble breaking that natural thought process. If you watch Petr Cech, he would sometimes go with his left hand when the right would have been better. Maybe it's something left handers have trouble with. Oh, I'm left handed. That explains a lot, I guess.