A recently had a post on how the US Treasury is influencing the longer-dated bond curve:

https://primal.net/e/note1sfptwc5qzah4tn5atrpqkht8466596hlv2allcf5zeak49gnt29q34qk6z

Here‘s some more insight on this topic:

Stephen Miran et al. call it: "Activist Treasury Issuance"

This podcast should be worth your time: https://www.youtube.com/watch?v=I-HembzMIvA