I would take it as a rumor, personally.
The gold reserves of the United States has been a particularly controversial topic through the years for obvious reasons. And talking about using a significant amount of them to buy an asset like Bitcoin will definitely find opposition from the democrat party (which harbors much anti-decentralization sentiments).
It is not a rumor, Bo Hines, the executive director of the President’s Council of Advisers on Digital Assets, is proposing a means to buy Bitcoin by adopting a budget-neutral strategy. He proposes to use the gains that the US has realised from gold investment to acquire Bitcoin.
https://cointelegraph.com/news/govt-realize-gains-gold-certificates-buy-bitcoin-bo-hinesother means to buy bitcoin rumoured to be proposed are:
selling the altcoins
selling fed real estate of empty HQ/office buildings after cutting the deadwood/draining the swamp
using funds from non tax related activity, like funds given from visa's, passports, drivers permits, other licencing/permit fee's
oil/gas/mineral sales