Artist changes controversy for Taimanin?

So this isn't exactly just related to Action Taimanin, but it is about the Taimanin franchise in general, so AT is involved.

I was looking up the merch for this year's summer Comiket and noticed that a lot of the official merch of various characters weren't drawn by their original artists. Thought it was just a simple matter, as other artists have done merch for Taimanin stuff before. But as I looked through the twitter of the artists involved, apparently there has been a controversy brewing where Aoi Nagisa, the artist for characters like Yukikaze, Shiranui, and Kirara, has apparently been let go? Since the end of May. Apparently this was due to Nagisa refusing to enter a contract with Taimanin management that allowed them to use AI art learning?

Can anyone confirm this? And if this is true, what does that mean for their characters in AT? Since the characters' costumes still use their art. Also considering that almost every character in the current Comiket merch is drawn not by their original artist, many people on JP are apparently worried that the other OG artists may share Aoi Nagisa's fate in the future.