Good catch! I think a few of us are investigating right now, but merging artists can be a big change that causes a big mess if done incorrectly, so it’s good that you brought this to the community’s attention. Good job! 
Did you know that there’s actually a thread dedicated to asking editors to look at, investigate, and vote on, edits? It’s right here, and you can post in that thread in the future for cases like this, if you want to bring other edits to our attention.
Happy editing! 