“Ich bin ein Berliner”..............I am a Jelly Donut!...............
Ber·lin·er (ˌ)bər-ˈli-nər. plural Berliners. : a native or inhabitant of Berlin, Germany.
That “donut” thing is one of those stupid mocking memes and nobody was even slightly confused.
There is a Berliner sauce, a Berliner Weisse beer, a Berliner Pastry etc. That donut thing is another of the mocking “look how smart I think I am” internet era “You won’t believe this” stories.