I do not know where they found the information to conclude there are no math based guarantees. The initial version of Monero had a flaw but if you start transa

I do not know where they found the information to conclude there are no math based guarantees. The initial version of Monero had a flaw but if you start transacting now I do not believe anyone can deanonymize wallet ids or amounts. Even if there's a 51% takeover, those guys would just be able to mint new coins, they still wouldn't be able to see the amounts and wallet ids. Also, confidential transactions and optimizations (bulletproofs) are math proven. Zcash and Dash with their optional privacy just leave everyone vulnerable to deanonymization.