Yeah, no. I'm pretty sure in your first link, that wasn't the author's reponse. The video shows a twitter screenshot of a tiktok, and that tiktok-er OP just stole the art. Seeing as Akio has never drawn genshin fanart, I doubt they would have "dilucseggs" as a tiktok handle.
Update: Just reached out to Akio in dm, confirmed that it was a reposter in the video.
^ This was a commision piece the artist never uploaded to twitter. It was requested a while back, but we didn't want to post it until we got Dachell's permission.