Is there actually any source for the reason it was painted over. Given that Disney is insanely protective of their IP it seems just as likely that they were removed for being unauthorised.
Have to remember this is the party that has a "hostile environment" policy to deter asylum seekers, they aren't shy about their aims.
The real test is have they replaced the murals with non-copyrighted alternatives to avoid the wrath of Disney, or was this just an exercise in dehumanising children.
A fair question, and one I don't have an answer for, but I'd think if'n copyright was the problem, they'd just replace it with something else that's in the clear.