I also doubt the rumor as you do, I can't think of a reason for an ESA astronaut on a Chinese trainer.Absolutely the dumbest, the most thoughtless rumor I have heard in a very, very, very long time. Who came up with this nonsense?
That pilot doesn't look like at all. Not even close. More importantly, . It's kind of tough to get away for a little joyride in China when you are 254 miles above earth in a metal tube with no easy way of getting off.
But I have to correct you that he is currently in Cologne, Germany, not in the space.