was he really chinese in the original story?

Yeah he was. Easy to find legit sources online. Read this.

also wasnt titanic about an asian guy?

Probably inspired by dozens of changs onboard that had sexual relations with wyte women. This really happened btw.

Another source for the earliest version about the story of Aladdin.

For starters, where does Aladdin live? Not in the Middle East. In the earliest version of the story we have, Aladdin is a poor youth living on the streets of China. And he’s no foreigner abroad either: he’s a native Chinese boy, not an Arabian youth who’s ended up in China. (Nor is he an orphan: in the earliest versions of the story, Aladdin is not an orphaned street urchin but a lazy boy living at home with his mother).