Block 170 is not the Block Satoshi Nakamoto used to send the first txn to Hal. Block 181 shows the actual txn. In it we see the send back feature of change to Satoshi Nakamoto that was unique to their wallet. In wallet 1cbq... Block 181 10 coins left in wallet went to Hal & sent 30 back to the origination wallet. This wallet was special & Hal wanted to keep it special. In the letter to Hal that morning at 12:00 Satoshi Nakamoto sender tells Hal coins were sent & the senders initials were in the wallet used to send it. That was 1-12-09 1:02am after the attempt to first test send of a txn in Block 170 was made. In the letter to Hal, Satoshi sends their regards on the morning of the Jan 12.

https://www.blockchain.com/btc/address/12cbQLTFMXRnSzktFkuoG... See for yourself. We are not uncertain & our source is very reliable.