The thing on reddit is just a transcription, not a photocopy of the original letter.
The more I think about it, the more I realize how much this has the WT scared.
Any JWs who heard of any "negative reports likely have already applied a similar line of reasoning ("evil media...half-truths...jw.org....Satan want to stop our preaching...")
Now, with the letter, 100% of JWs (at least, 100% of those who attended meetings where the letter was read) are aware of "negative reports".
By drawing attention to the matter, the WTS is ensuring that some curious JWs will fire up their google searches and find all kinds of damning information.
The usual WT MO is just to ignore bad press. They must be extraordinarily bothered to risk stirring up the curiosity of the rank & file who otherwise likely wouldn't have paid any attention.