That tunnel won't help against real adversaries. Timing attacks and text content analysis will expose you. It's getting harder to be truly black online.
The solution to that is to use memes and bad grammar. I am not kidding. Keep your messages really brief and have a community of people that talk in a very similar fashion to one-another.
Another option is to use translation services, en->fr->ja->de->en. Reread message -- does it say what you mean? If yes, go for it! If not, modify as needed.
The only reason i can imagine they're writig this way is to foil stylometry.
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