Is there any VUSDC that can't be exchanged back? 20% discount for purchase

Binance Wallet's latest VELVET airdrop event, I have written a detailed article on the steps, but it seems you can't see it in the message. It's actually quite simple, the first three social tasks, and the last two tasks, one is redemption and the other is staking. Please pay attention while doing it, just make sure to stay on the BSC chain. There are 10,000 reward slots, wishing everyone good luck.