UPDATE
On February 3rd 2020, the artist reappeared on Twitter, publishing a thread of tweets in which they apologized for the sudden disappearence, mentioning serious IRL problems as the cause of it. The artist says that they will be slowly answering everyone's messages and offering refunds (throught a future form) for those who want it, just asking for a little more of patience in return for this to happen while reorganizing with IRL stuff.
By the time of this update, the artist has yet to answer any of my messages but in regards of the current situation, I guess I'll have to keep waiting some more.
Thread of artist's tweets: