The full name "Jia Cheong Tan" doesn't sound like Mainland China. The name and actions could be intentionally misleading though.
Also nobody checked that person's id, so "Jia" is only slightly more meaningful than "ghrssbitrvii".
Unless you have some very specific cultural knowledge you could not make even vaguely useful deductions about my location, nationality, culture, ethnicity etc. from my name. I get a lot of wrong guesses though!
And some others hints at Eastern Europe, comparing the timezones. Taiwan ist still the strongest hint though.