The article I linked said it happened. The article you linked quotes the governor as saying it happened. It also quotes some others who said it didn't happen or, perhaps more accurately, they didn't see it happen. It sounds to me like there is a disagreement as to whether it happened or not. Just because some people said they didn't see it, it doesn't automatically mean that it didn't. As your article states:

Neil Duke, who moderated the event for the NAACP, said last week that he didn't see any cookies.

"Were there some goofballs sitting in [the] right-hand corner section tossing cookies amongst themselves and acting like sophomores, as the legend has it?" Duke said. "I have no reason to doubt those sources; I just didn't see it."

Sounds like an honest answer to me. I wasn't there, so all I have to go by are the reports of what happened that night. Some say yes, others say no.