FYI, he was banned for 3 months.
Anyways, the data of the 1897 Russian Empire census at Мови та релігії у повітах Російської імперії does show Han Chinese in Outer Manchuria. Along with the Manchus and the Daur, they made up the 64 villages, read...
For your information, one reason why Inner Manchuria's fertility rate is so low is because there are very few ethnic minorities there. Ethnic minorities were exempt from the one child policy.