The trader sold 1 SPK for 19,600 USDT — due to a mistake in the pool settings
Before starting trading, the user teochew.eth created a SPK/USDT pool and contributed almost 20,000 USDT — without SPK tokens, only in dollars.
He wanted to set the price: 1 USDT = 19 SPK (meaning SPK was supposed to cost ~$0.05), but he mixed them up and accidentally indicated the price the other way around: 1 SPK = 19,000 USDT.
The trader with the address 0x7ef29 immediately noticed this and sold 1 SPK for almost $20,000, instantly withdrawing all the liquidity from the pool.