Data: An address purchased 80 BTC for 5.2 million USD 4 months ago and deposited it into Ledger, with all assets lost

According to monitoring by Lookonchain, a certain address purchased 80 BTC for approximately 5.2 million dollars 4 months ago, with a buying price of about 65,000 dollars per coin, during which it made a profit of 1.38 million dollars. A week ago, the address purchased a Ledger device from the reseller CryptoBillis and deposited all 80 BTC into that device, and currently, all assets have been lost.