Strix Serenade triggers on being destroyed from the library

Xibvert

Strix Serenade should end up in my graveyard when destroyed from my library but it doesn't.

Destroy
A card is destroyed either when it loses all of its toughness/shield counts or when another effect or spell demands it to be destroyed. When a card is destroyed, it is moved to the Graveyard. Cards that were exiled don't count as “destroyed”. Also, effects that trigger when a card is destroyed only happen if it's destroyed while onto play, and not if it was destroyed while on the library or hand.

https://d3go.helpshift.com/hc/en/4-magic-puzzle-quest/faq/953-magic-puzzle-quest---gallery-of-rules-and-definitions/

You can see in the following image that every time I cast Traumatize and target myself that Strix Serenade is triggering off of being destroyed from my library, which isn't supposed to happen according to the rules for destroy.