this seems like letting Dan off way too easy.
From reading comments it sounds like wotc admitted they used the wrong version. There also was a back and forth between Dan's agent and wotc over his original submission. Dan, a classically trained artist, normally submits oil paintings. The art for this set was required to be all digital.
I very well could see Dan having submitted the work he wanted, wotc saying no, they send him Marta's work as reference, he flips it, smudges it, tosses it on a stock background, and resubmits it as a 🖕to wotc, they shrug and print it.

