Dread Wanderer's ability activated after it was exiled

Tempus

Dread Wanderer's activate ability triggered (and it returned to the battlefield) after I exiled it with Wrath of God.  The activate ability text says it "only activates after this creature has been destroyed."  This happened to me just now in the Trial of Strength event, in the 3rd node (going clockwise).  This appears to be either a bug, or a typo in the ability description.

I don't know if it can be reproduced with Vindicate, or with G3's 2nd ability (after a steal), which are the only other ways I can think of to exile a creature from the battlefield at this time.

For reference:

Name: Dread Wanderer

Expansion: Amonkhet

Rarity: Rare

Colors: Black 

Cost: 15

Type: Creature

Subtypes: Zombie, Jackal

P/T: 4/3

Abilities: Activate, Defender, Return to Battlefield

Activate 2: This creature is Returned to the battlefield. This ability only activates after this creature has been destroyed. When this creature enters the battlefield, it is Disabled until the beginning of your next turn.

Name: Wrath of God

Expansion: Amonkhet

Rarity: Masterpiece

Colors: White 

Cost: 7

Type: Spell

Abilities: Untargeted, Exile

Each creature on the battlefield is exiled.