Is this official Terraria merchandise AI-generated?

UPDATE: The T-shirt has been taken off the Terraria store and an update was created on this issue:

> https://www.reddit.com/r/Terraria/comments/1givyfk/flying_dutchman_shirt_an_update/

Hi, I'm scrolling through Terraria's official merch store, and I came across a T-shirt--specifically the Flying Dutchman one--that I believe to be AI-generated:

The Flying Dutchman T-shirt

I've come to this conclusion solely based on the fact that the artwork contains mixels--inconsistencies within pixel scaling--and imprecise detailing. I find this surprising given that it's official Terraria merchandise, so it's no wonder that I'm concerned about this.

If this is indeed AI-generated artwork, I'd argue against its use--we Terraria fans expect high-quality merchandise from the game's official store--especially coming from a well-known and loved game like Terraria.

Since there wasn't a 'question' flair for me to add, I added 'art' instead.