Nexus family of switches DO NOT support Power over Ethernet (PoE). The logic behind it is that Nexus family of switches are not meant to be access switches for IP phones and computers but rather DC work.
This is false statement : Cisco Nexus 9348GC-FXP-B1, has Poe capabilities:
At the time this question was posted and answered by Leo (In 2017), there was no POE support on Nexus switches.
The link you posted is referenced to product from 2018 and later.