Yeah Monero is complete anonymous and transactions can't be traced while using this coin.
I'm really not sure since I barely have a lot of knowledge on this but long ago (most likely in 2018/19), I have read an article where they mentioned that it was possible to trace Monero transactions even. I can't find the article at the moment, I tried with google and found an article by coingeek where they mentioned with the help of CipherTrace tool,
Monero transactions can be traced.
Not anymore.
There were a total of only 10 grin transactions. Currently grin is not accepted because it broke a while ago and I never got around to fixing it.