This is actually a huge deal and it's barely being talked about. This is Quantitative Easing. They didn't announce it which is highly suspect. There aren't a ton of reasons to do this and try to hide it. One I can think of is that there arent enough buyers of US debt at the centrally planned intrest rate so they have to step in and buy the UST to maintain rates.

There are a lot of ramifications of QE one is that it is a huge liquidity pump for the markets. That is a very good thing for bitcoin.