You can safely conclude that he is lying about advising the purchaser of the painting of he fact that it was copied from another person's work
Churchill is a person of the lowest character, and it is amazing that he was able to stay in the academic system at Colorado for as long as he was. I blame the PC lefties who have taken over our Universities - once Churchill said "American Indian" and Oppression" their brains turned off, and he was no longer subject to any type of intellectual or character standard, he was instead given a carte blanche to disseminate his sickness among the most impressionable of our children that we put into his care.
If this were an isolated incident, we could shake our heads and be glad we aren't the regents at CU who have to clean up this mess. But, I think we can see, that this is not an isolated incident. Political correctness, no matter how absurd, as replaced critical thinking in almost all of our universities. While there are good professors at universities, unfortunately we also see characters such as Jay Silverman at Harvard University, and countless others I am sure you could name, have used standards designed by Diane Glompers to turn our colleges into fantasy playgrounds for the mentally damaged, a safe haven for the disturbed who could not survive if they had to meet any kind of real world standard.
I hope the entire higher educational community stops and thinks about how this happened. And uses it as a lesson to raise their standards, for their students' sake.