There is no "in other words."
In this post
, you say, "I bought a Mikrotik PowerBox (didn't realize at the time there was a Pro version)."
You have Powerbox, which is old model
(although still sold) and uses only passive POE. ROS command shown is available on old model, and usually always needed.
Powerbox Pro is new model, uses 802.11af. ROS command provided is not available there, and not needed, because power supply is entirely different. But that doesn't apply to you because you don't own one!
Have you even tried using the command I provided images of?