The latter. What these buybacks will do is drive up the value of the bond, which means there will be more potential buyers interested in purchasing them. Furthermore, if we recall that this government promised to buy bitcoin – albeit in ‘budget-neutral ways’ – and is spending a great deal of money on this and other things, I cannot see how this could benefit the bitcoin market.
Sum of money is the same, so if government spend money to buy bonds, they will have less money for other things like buy bitcoin but historically the USA government has never bought bitcoin.
This site
https://www.worldgovernmentbonds.com/ can help us, anyone who are interesting in tracking bonds globally. It's the World Government Bonds with a lot of information like 10-y bond yield, bank rate, and more.
Even without this bond buy back from US treasury, there will still need a long time until the USA government and USA Treasury proactively buy bitcoins.