Oh okay, he didn't explained how he used the tool.
Such spend has to be done manually by entering the input's details, the txid, vout, scriptsig (minus the size) which is "51027551" and amount.
Then the output and its amount considering the fee, don't forget to change the coin setting to Bitcoin (testnet).

You can even reproduce the raw transaction that he shared in the OP by filling up with the same details of his transaction.

Inputs;
TXID: 85fd05407575d31155824f6cdbaae1b544af78158cc643dd4d8f7c7351ef5bfb | N: 0 | Script: 51027551 | Amount: 1
Outputs;
Address: 2N2EJxoRy5hRE74aV4NDiC22dcH3QEqzf5G | Amount: 0.99999

Then submit it.
Check the result transaction with his Byte by Byte. Take note that the address "2NAfhvQFw2GR1A1iN8Eke47HqVuDcsW4Uzw" is wrong.