Transaction fees can help you understand about it more.
Andreas says the input side (eg, 100,000 satoshi) will not be equal to the output side (eg, 98,000 satoshi). He said the difference is the transaction fee paid to the miner (2,000 in this example), but this fee does not appear in the transaction.
With Bitcoin blockchain, when you make an on chain transaction, you will have to pay transaction fee to Bitcoin miners who confirm your transaction. So input value = output value + transaction fee cost.
Even if you send bitcoins from your address to another address of yours, you will not receive the same input value as your receiving value, because as said, there is a part goes to Bitcoin miners as transaction fee.