Do you mean a Native Russian or simply a user proficient enough (TPКИ-2 or higher) on Russian Language? I don't think having a passport of a Nation State should be required to do moderation in forums.
Technically, the moderator may be even Chinese. But the Chinese never catch the whole meaning written in the Russian section. For this he needs to become a Russian - So he must be Russian
I don't agree at all with your assertion. A TPКИ-2 level foreign user can understand the main ideas of complex text on both concrete and abstract topics, including technical discussions in his/her field of specialization, can interact with a degree of fluency and spontaneity that makes regular interaction with native speakers quite possible without strain for either party, can produce clear, detailed text on a wide range of subjects and explain a viewpoint on a topical issue giving the advantages and disadvantages of various options.
However, if you want "humor" to be recognized a proficient user like the ones at the TPКИ-3 and TPКИ-4 maybe up to the task.
I could have agreed with you IF you were saying majority of Chinese users are not at levels high enough to be a TPКИ-2, -3 or -4.