The real USDtb isn’t available on BNB Chain, so that was one red flag. Another red flag is that it doesn’t make sense to swap one stablecoin to another through a forum and with a 20% discount. If it’s a legitimate token, there should be liquidity pools on decentralized exchanges where you can trade it at a nearly 1:1 ratio with other stablecoins. Technically, there is some DEX liquidity, but it’s only around $4, which is why it was way off peg.