So he removed the RJ45 jack from the LAN8720 completely, and wired that directly to the connector on the PoE board. Helpfully, the PoE board had all the pins labeled on the bottom side so this ...

which supports IEEE 802.3af (PoE, 13 W) and IEEE 802.11at (PoE+, 25 W) standards, and mains voltages between 100 V and 240 V. Plug in a mains lead (not included) and some RJ45 connectors ...