If it's at a website, it's suspect, especially if they don't cite a source.
Naval Weapons of World War Two, by NJM Campbell, lists every gun used by any nation during the war, including mounting types and ammo. While he doesn't specifically rule out AP and SS rounds for U-boats, he does say in his listings for the 8.8cm and 10.5cm guns "including Armour Piercing and Star Shell for minesweepers and patrol craft".
I'll trust the most respected expert in the field over any website.
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