When it comes to privacy, monero should be your go-to solution. That's tried and true. If you want privacy for other blockchains, I definitely recommend checking out the work going on at
incognito.org. They are working on some great solutions to add privacy in a legitimate way.
When I first saw the site you provided I first thought of it to be another alternative cross chain privacy trading platform for cryptocurrency but I was disappointed when I see that the crypto they provide on are not actual Bitcoin, ETH, etc. What they provide is pBTC, pETH which is a shitcoin.
I think it best I use the privacy wallet and Crypton Exchange when privacy is a top priority since the Crypton Exchange always makes anonymous trading look legit.