I still think it's silly to assume that Disney only (or even primarily) added the "Inclusion" Key for PR. In instructional design, you employ mnemonics like the Keys in order to organize the content and aid the Learner in retention of the material. You elevate a topic to become a category (like they're doing with "Inclusion") in order to give it greater emphasis than it had been given and, in this case, to better show how it relates to the other categories.
They could have added new/additional Inclusion training under the "Courtesy" Key and promoted "patted themselves on the back" for that. They could have introduced an entirely new standalone training module (something like "Inclusion the Disney Way"). If they were really after a PR bump out of CM training, they could have closed the parks for a day of training (a la
Starbucks).
I understand the suspicion and the social/political reactions to everything these days, but to me these changes make sense if Disney is actually trying to do what they say they're trying to do.