I’m massively skeptical of this.
Looks like western writing. I don’t think that dirt-floor, sparking-wires sweatshop workers print English that way.
I'm not. The letter contains Chinese writing that is not translated in the post, however I'll wager it attempts to add clarity in Chinese to what the author assumes may be inadequate English writing.
But, bottom line, I would wager that the letter gains no relief from the slavery that so many Chinese suffer - particularly huge numbers of Christian Chinese.