I cannot find any links either. Looks like these videos have been removed in the wake of the anti feminist video from the developers? I don’t know.
If you have access to the BlizzCon 2018 ticket, I suggest looking there for the AI comp stomp feature. But it did happen. Found this at least:
I’m totally fine with them to be honest. It’s about diversity for me but I do understand when people dislike them. But still better than another human race.