Your link contradicts what you're arguing for. Note that the block explorer only shows "total sent", "total received", and "final balance", not which specific coins.
If your wallet has 10 BTC in it and you send someone 1 BTC, there is no way to know which one of the 10 Bitcoins was sent. It is literally not part of the implementation of Bitcoin.
If your wallet has 10 BTC in it and you send someone 1 BTC, there is no way to know which one of the 10 Bitcoins was sent. It is literally not part of the implementation of Bitcoin.