This isn't proof of of proper tracing. Its proof that ring signatures are not perfect in this panopticon world which is already known and more importantly a proper fix is being worked on. More safeguards can be applied by the paranoid by how you obtain (no kyc/no coin swap) and use (network level privacy/full node) monero. Fud. This just helps visually understand ring signatures and may have the opposite of their desired effect for those that dig deeper.