More than a few people were unsatisfied with this reporting, asking more transparency around who these "counterparties" were. Ultimately, this action benefited the "counterparties", providing liquidity to these whales who were able to exit their now risky UST positions for a good price, and did not help most of the individuals holding UST.
Many were eagerly awaiting a report from Luna Foundation Guard (LFG) on what happened to the several billion dollars' worth of Bitcoin reserves they once held, which they transferred during the UST collapse. The organization tweeted an explanation of the actions they took with those funds on May 16, describing how they began to convert Bitcoin to UST. They referred to transferring BTC and other reserves to "a counterparty", who traded them UST in exchange. They didn't name who these counterparties were.