It's actually Korean, not Chinese.
The sysop clears them out at least daily. It appears the sysop gets to work around 8AM.
There is another batch appearing now - user taj58488
Add the Tesla Forum Enhancement Suite to your browser and you can easily block them. Takes a few seconds, then the page is all clean.
This suite also gives you a forum search function.
how do you add the enhancement suite?
The Enhancement Suite is a browser extension. I know it works in Chrome; don't know about other browsers.