Grin is currently not untraceable (it only hides amounts and addresses, but not input-output links, which are mostly visible in the mempool), but could be if the coinswap proposal [1] is implemented and widely deployed.
OP listed Zcash which is the same so it seems fair game. I think it's also important to list it as Aztec can interact with DeFi privately and also be programmed which allows for complex interactions and an economy where money goes in and doesn't come back out often. This increases privacy and also allows people to actually use money instead of just temporarily hiding it.
Other than Monero and ZEC (the latter of which has some issues for me which I posted about before) Grin is the only other project that isn’t a clone.