There's a general level of distrust and dislike for China here, as in many of the Belt & Road nations*. Add that to the general level of distrust for Covid vaccinations, and that would be a safe bet.
*China is a lot like the spoiled rich brat that kids only hang out with because he has the cool toys and cool games. But no one really likes him, because he's an abusive jerk & bully that demands his way or he'll take his toys and go home.