I'm very curious to see how this investigation plays out, especially considering the debt situation here in the US. It appears (according to tether's audit reports) that tether went from about 64 billion in treasuries mid-2023 to about 92 billion mid-2024. That's 27 billion in demand for treasuries over that one year period which (if my math and research is correct) is about 3% of all treasury demand for roughly that time period.
It does appear that tether holds short-term maturity treasuries, and I don't know how that fits into the larger demand picture.