The Warforged race from the initial version of Wayfinder's Guide to Eberron (which matches the version in UA: Eberron Races) has a unique feature, Integrated Protection, that affects their armor class (AC) and ability to wear armor, detailed below:
Your body has built-in defensive layers, which determine your armor class. You gain no benefit from wearing armor, but if you are using a shield, you apply its bonus as normal.
You can alter your body to enter different defensive modes; each time you finish a long rest, choose one mode to adopt from the Integrated Protection table, provided you meet the mode's prerequisite.
Mode Prerequisite Armor Class Darkwood core (unarmored) None 11 + your Dexterity modifier (add proficiency bonus if proficient with light armor) Composite plating (armor) Medium armor proficiency 13 + your Dexterity modifier (maximum of 2) + your proficiency bonus Heavy plating (armor) Heavy armor proficiency 16 + your proficiency bonus; disadvantage on Dexterity (Stealth) checks
Nowhere in this description does it say anything about the "built-in defensive layers" counting as armor for the purposes of wearing armor, but this is heavily implied by the table's parenthetical descriptions following each mode, such as the medium mode Composite Plating (armor).
While you are wearing armor, you gain a +1 bonus to AC.
and the Rage feature that barbarians receive at 1st level (PHB, p. 48; emphasis mine):
In battle, you fight with primal ferocity. On your turn, you can enter a rage as a bonus action.
While raging, you gain the following benefits if you aren't wearing heavy armor: [...]
Is the feature text more authoritative, not specifying the Integrated Protection as armor worn?
Or is the table with its parenthetical descriptions more authoritative, meaning that the second and third options count as wearing armor for the above features?