Let me ask you a question

If you were a big holder of a stock - would you announce that you were about to sell a bunch of your stock? of course not.

What if you were a country that is a huge holder of the dollar? Apparently, it is bullish and a surprise to the media when countries don't come out and denounce the dollar (like Russia today - basically supporting the buck today). I imagine they will do that when they aren't as knee deep in it - just like a common investor does once he is out of a stock.