My take:
I think the marketing folks intentionally put a series of black people along the path before the (light) beer arrived at the (light skinned) woman. I do not think they did this to endorse racial superiority. I think they did it to subliminally reinforce the dark/light theme.
In fact, I would even believe the producers if they said they were so non-racist that it didn’t even occur to them that people might take it as some kind of statement on race. But like Dlew said, that’s not an excuse these days in marketing. “Could people view this as racist” is absolutely a box you HAVE to check before green-lighting an ad.
The other explanation is this is yet another attempt at viral marketing by creating something controversial.