I'm afraid I have to disagree. I don't see this as "desperate ignorance" I see it as wondering about the vague wording many companies use on many products. "Natural" is incredibly ambiguous, and I'm sure a lot of people wonder about weaves, "natural flavors" in sodas, composition of stuffed animals' casings, etc. The only part that could be the slightest bit "racially offensive" is at the very end, when she plays into the "angry black woman" stereotype. (Please note, I'm not saying I believe or condone that stereotype in anyway, just that it is recognizable meme in American culture.)
I agree that these commercials are inane and annoying, but I don't see this one as racist.