RFK Jnr is trying to be the next President himself. It doesn't make sense to me while he would be trying to help his competition pick up votes.
I don't believe for a second the US government would buy Bitcoin. The Federal Govt spends money on projects or allocates to the states for projects. The Federal Reserve might buy assets as part of a quantitative easing but they are supposed to be non-partisan and quantitative easing increases inflation.