This is astounding, I look forward to the time where these types of changes revert back to common sense.

You're going to be waiting for a while then.

Lengthy copyright is a big part of the problem here. Another recent censorship kerfuffle was over Dr. Seuss—one of the books in question was published when my grandmother was in diapers, yet the copyright holders have exclusive control today, more than three decades since Seuss’s death, and will retain it for another full decade from now.

I bet this is much more becase red tractors are easier to convey in the inevitable cartoon adaption. Or the hope John Deere will pay for them to be green.

It was made into a stop motion movie by Wes Anderson.

Could we call them "tractors of color"? Would that be palatable?