The Tornado Cash smart contract is immutable and hence is still live on the Ethereum blockchain. I'm not sure about that IPFS site, but you can still use Tornado Cash today as long as you know how to manually interact with the smart contract.

Take note that Ethereum and "DeFi" is pretty much useless if a takedown of its front-end website literally kills the platform. The authorities can only take down the domain and the front-end; but the back-end will always be live.