Hi, author of the Medium article here. The block containing the transaction was mined at 4:57pm EST (21:57 GMT) on 1/26:

https://blockexplorer.com/block/000000000000000001b12145b9ba...

https://blockchain.info/tx/143a764d3fa405f428e1d0e5b9d01b88e...

This tweet showing the screenshot is clearly earlier:

https://twitter.com/evanoconnell/status/824614832691355648