"Furman said Schulte continued his crimes from behind bars ... by creating a hidden file on his computer that contained 2,400 images of child sexual abuse that he continued to view from jail."
How do you get 2.4k images on a jail computer? Manifest it out of thin air?
Considering CIA is involved, which is known for torture, human experimentation, poisonings, planted evidence, etc. I'd not be too surprised if that file was straight up planted as an extra "fuck you" to the guy.
Even with the character in Public Domain, I doubt Disney would be particularly happy with anyone using it.
They can send cease and desist letter left and right, claiming that "the use of the mouse is fine, but the elements X, Y and Z were introduced in a later work of ours that's still protected", even if it's a plain lie.
Trying to take Disney to court is suicide.
The have enough money to hire half the lawyers in the world and make them come up with a lawsuit even if there's no basis for one. They can stretch the lawsuit process to last years, and yet the fees would be but a fraction of a fraction of a percent in their yearly spending. Almost any defendant, meanwhile, would be financially ruined by it, even if they end up winning.