It looks to me like the author was building a point about evolutionary bootstrapping of brain growth by eating meat ("but eating meat apparently made our ancestors smarter - smart enough to make better tools, which in turn led to other changes, says Aiello"). Brain growth was later accelerated when early humans gained the intelligence to cook.

From what I understand about brain development from my child's pediatrician, dietary fat is important. I don't think the calorie argument is airtight. There's more to the story than is presented here.

Anyway, the author opens with information from one source who seemed to focus on meat and later includes information from another source focusing on cooking. An editor probably read two paragraphs and wrote the headline. Nothing to get bent about.