Nope. He is -9, starts with about what, 150ish CA? On average he'd have aobut 165 PA , there's no room there to improve shot stopping significantly.
Look, the numbers are numbers, ter Stegen is awful shot-stopper, well below solid PL level. No communication is going to stop every shot unless you expect him to communicate the ball to turn the other way.
If , according to some of theories here, he can only unreliable be because of bad defenders or tactics, isn't great
communication exactly the thing to make up for that? Oh right, so it was just good ol bad goalkeeping after all.
Yeah, i believe so. He also sucks for pure shot stopping, but has 2 things going for himself - better concentration and better positioning. Plus, he is a sweeper-keeper, which is a whole different box of cookies.