Oddly enough, I think the linguistic bit is inaccurate as well. I don't believe there's any dialect of Chinese where sensei is pronounced the same as in Japanese — it's pronounced "sehn-say" in Japanese, "shyan-shung" in Mandarin and (IIRC) "seen-son" in Cantonese. (Also, though it kindasorta means "teacher," the word is more closely equivalent to "mister" in modern Chinese. Actual teachers are laoshi.)