An institution/whale that built a warehouse of 41,567 ETH four years ago deposited 3,000 ETH into CEX eight hours ago

According to on-chain analyst @ai_9684xtpa, an institution/whale that bought 41,567 ETH at an average price of $421.7 four years ago is suspected of partially taking profits with a return rate as high as 807%. Eight hours ago, they deposited 3,000 ETH into CEX worth $12.13 million; in the past two weeks they have deposited a total of 8,957 ETH (approximately $32.46 million). If sold, the profit would be around $30.48 million and currently they still hold ETH worth about $17.75 million.