When you accept the Level 10 Arcanist job quest, "Tactical Planning," from Thubyrgeim, she mentions the benefit of using Bio with Aetherflow. The ability to use Aetherflow (through Energy Drain), along with its job gauge is not granted until Level 18 since 5.0.

So, this is very confusing to a new player and really should be removed from the quest text, or modified to something else.

The quest location is:

Limsa Lominsa Lower Decks X: 4.7 Y: 11.4

To duplicate:

1. Trigger "Tactical Planning" as a Level 10 Arcanist.
2. Read the quest text from Thubyrgeim.