Given the bitching you see every Thursday on Miiverse by people demanding a particular VC title that hasn't been released, I would think Nintendo would be quite enthusiastic to publish your post...
Your post is far more positive...

Aye, they should create sub-forums within any community that exceeds a certain size, otherwise it only becomes so much noise.

It's a good idea, but still needs a bit of ironing out. Should be cool for screenshot-dumping, should I ever decide to do such...

Pretty sure they monitor tone, so usage of words like 'fan' or 'sales' or hinting as to speculation on why Nintendo abandoned a IP to limbo will get you hit by the Miiverse police.

Miiverse isn't about freedom, its about community within guidelines, a nice place to visit but heaven help you if you try to live (or make that your primary social media outlet) there.

That being said, easily one of the few really good things Nintendo did in regards to the Wii U.

Are you sure that was the exact message? If so, then this was a bug, because Miiverse only allows 200 characters and your message was 205. Possibly there was nothing offensive but it somehow gave you that error message instead of the correct one.  There is no way for the "tone police" to cause an instantaneous error.

EDIT: Unless the post you were replying to got yanked while you were typing, perhaps.

My experience on MiiVerse is nothing but good, aside from friends posting offensive things when im out of the room and me getting Admin warnings of course.

The ability to talk to people, respond to people needing help, request help if you need it, share drawings and thoughts and post tips for all to see is incredible.
I like that it is heavily moderated, it keeps the general vibe of every community within MiiVerse positive, which makes for a much better experience.

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Nooooooooooo....>_>

That could help, or maybe in the future they'll let the users create threads... that might sort some of the posts.
I also thought they were adding additional filters to help you manage soo much information.

Never used Mii verse. I rather just discuss here. I wish there was a way to limit Mii Verse sections to people you allow. I would use it more.

Miiverse sucks for what Nintendo wants it to be but is great for what players are forcing it to be.

Go there for game help, chat with friends, say how much you love a game? LOL no, just use the internet.

Go there to make sick ass drawings or troll? Checkmate.

Miiverse is cool, there are some very clued up and educated gamers there, that actually know what they are taking about. A breath of fresh air indeed, ive engaged with some decent people on Miiverse.