All the penetration curves and calculations in the world can't beat an actual event, described by those who were there, on whose testimony knowledge of what happened aboard a ship that was sunk has to be based. No "impossible" dismissals made 70 years later carry anywhere near as much weight IMHO..
German survivor testimony, German author: (Fritz Otto Busch - The Sinking of the Scharnhorst) (my emphasis - bold, italic, underline)
In other words, like it or not, according to someone who was there, Scharnhorst's A- magazine chamber was penetrated by a 14-inch shell, apparently late in the battle. Not sure what range DoY was firing from at the time. Never say never....When the Captain’s exhortation “Scharnhorst immer voran” reached them, they looked at each other and smiled. The knew that every section of the crew was doing its utmost to honour their ship’s motto. But the smiles left their faces when within a few seconds the ship was struck with unprecedented force and began to tremble violently along her entire length. The emergency lamps fell from their mountings; the men set to and replaced them as further heavy explosions occurred. They looked at the Signals-Transmitter questioningly. He shook his head:
“Nothing’s come through so far.”
“That was a torpedo hit,” said Chief Petty Officer Moritz, the Chief Gunner. “It couldn’t have been anything else.”
They fell silent. At length the Signals-Transmitter had another bulletin:
“B-turret to damage control party: Order to flood! Magazine chamber B-turret to be flooded.”
The men listened aghast: was B-turret also out of action now? A-turret had remained jammed since the first encounter with the British battleship. Must B go too…? But then they heard B-turret firing again, distant and subdued, but clearly recognizable. Enveloped in smoke and fumes it was to keep firing to the last. The men relaxed again.
It was not until he was in captivity that Strater learned from Able Seaman Birkle, another survivor, what had actually happened. Birkle was a member of the gun crew of B-turret. A-turret had received a severe hit – the second of the day – in its magazine chamber. Violent explosions had followed, the smoke of which completely enveloped B and red hot splinters had penetrated the bulkheads protecting the magazines. The Chief Gunner took the immediate and reasonable precautions of having the magazines flooded. It had, however, proved possible to pump them out again a quarter of an hour later.