If the proportion of foreing nationals with the intention of building their life in your country is minuscule, them having significant representation in the general power structures is a non-issue. It wouldn’t surprise me if, in the event that China grew a significant immigrant community, they still wanted to deny them representation, but complaining about that right now is akin to a Brazilian complaining that Norway wants them to protect their jungle when Norway isn’t protecting their own jungle.
If I was a good-hearted Chinese politician, I would also be trying to get Chinese migrants in Western countries to get adequate representation, because that would help them get some muscle to protect themselves if they were ever going to be discriminated against.